Mustapha El Halaoui

Abdelmalek Essaâdi University

*This is an algorithmically generated author record based on publicly available information.

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Abdelmalek Essaâdi University

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Mustapha El Halaoui has a total of 32 co-authors. Here are the top co-authors by number of shared publications:

Adel Asselman
Abdelmalek Essaadi University
11 shared publications
Saida Ahyoud
Abdelmalek Essaadi University
9 shared publications
Abdelmoumen Kaabal
Abdelmalek Essaadi
8 shared publications
Adel Asselman
Intelligent System Design Laboratory, Optics, Materials and Systems Team, Faculty of Sciences, Abdelmalek Essaadi University, M’Hannech II, P.O. Box 2121, Tetouan 93030, Morocco
5 shared publications
Laurent Canale
Université de Toulouse, Toulouse INP, CNRS, LAPLACE, UMR 5213, 31000 Toulouse, France
4 shared publications
Georges Zissis
Université de Toulouse, Toulouse INP, CNRS, LAPLACE, UMR 5213, 31000 Toulouse, France
3 shared publications

Latest Publications

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Open Access
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- 15 September 2026
- Published by MDPI AG in Electronics
Physics-Based Modeling and Multi-Objective Optimization of Fluorescent OLEDs Accounting for Dopant-Singlet Exciton Losses
by Mohammed El Halaoui, Mustapha El Halaoui, Ibrahim Saadouni, Lahcen Amhaimar, Adel Asselman, Bousselham Samoudi
This article presents a multi-objective optimization framework for fluorescent organic light-emitting diodes (OLEDs), combining numerical simulation with an analysis of exciton populations and the associated loss mechanisms. An ITO/NPB/Alq₃:C545T/Alq₃/LiF–Al structure was modeled, calibrated, and validated against experimental electro-optical characteristics. The influence of the emissive layer thickness ( $t_{EML}$ ) and the C545T doping concentration ( $D_{p}$ ) was systematically studied across 25 configurations, with $t_{EML}$ = 20–40 nm and $D_{p} = 1$ – $9 %$ , under two operating conditions: $J = 0.15$ A/cm² and $L = 5000$ cd/m². Increasing the dopant concentration led to a marked deterioration in current efficiency ( $η_{c}$ ) and power efficiency ( $η_{p}$ ), together with a progressive localization of singlet excitons near the interface between the emissive layer (EML) and the hole transport layer (HTL) in structures with thinner EMLs. This exciton localization was accompanied by an increased contribution from non-radiative deactivation pathways, which were incorporated into a dopant singlet-exciton loss fraction, $F_{loss, d}$ . The systematic increase in this loss fraction with increasing dopant concentration and its overall inverse relationship with $η_{c}$ and $η_{p}$ motivated the development of a three-objective formulation that maximizes $η_{c}$ and $η_{p}$ while minimizing $F_{loss, d}$ . The Non-dominated Sorting Genetic Algorithm II (NSGA-II) identified compromise solutions at the lowest dopant concentration, $D_{p} = 1 %$ , with $t_{EML} = 24$ –25 nm under both operating conditions. Multi-objective Particle Swarm Optimization (MOPSO) identified a trade-off region comparable to that obtained by NSGA-II, providing a cross-algorithm consistency check of the reported numerical results. The proposed methodology thus establishes a physically grounded link between device design, the spatial redistribution of excitons, the modeled loss pathways, and the macroscopic performance of OLEDs, thereby providing an interpretable framework for the multi-objective optimization of fluorescent OLEDs prior to fabrication.
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- 15 September 2026
- Published by MDPI AG in Electronics
Open Access
Physics-Based Modeling and Multi-Objective Optimization of Fluorescent OLEDs Accounting for Dopant-Singlet Exciton Losses
by Mohammed El Halaoui, Mustapha El Halaoui, Ibrahim Saadouni, Lahcen Amhaimar, Adel Asselman, Bousselham Samoudi
This article presents a multi-objective optimization framework for fluorescent organic light-emitting diodes (OLEDs), combining numerical simulation with an analysis of exciton populations and the associated loss mechanisms. An ITO/NPB/Alq₃:C545T/Alq₃/LiF–Al structure was modeled, calibrated, and validated against experimental electro-optical characteristics. The influence of the emissive layer thickness ( $t_{EML}$ ) and the C545T doping concentration ( $D_{p}$ ) was systematically studied across 25 configurations, with $t_{EML}$ = 20–40 nm and $D_{p} = 1$ – $9 %$ , under two operating conditions: $J = 0.15$ A/cm² and $L = 5000$ cd/m². Increasing the dopant concentration led to a marked deterioration in current efficiency ( $η_{c}$ ) and power efficiency ( $η_{p}$ ), together with a progressive localization of singlet excitons near the interface between the emissive layer (EML) and the hole transport layer (HTL) in structures with thinner EMLs. This exciton localization was accompanied by an increased contribution from non-radiative deactivation pathways, which were incorporated into a dopant singlet-exciton loss fraction, $F_{loss, d}$ . The systematic increase in this loss fraction with increasing dopant concentration and its overall inverse relationship with $η_{c}$ and $η_{p}$ motivated the development of a three-objective formulation that maximizes $η_{c}$ and $η_{p}$ while minimizing $F_{loss, d}$ . The Non-dominated Sorting Genetic Algorithm II (NSGA-II) identified compromise solutions at the lowest dopant concentration, $D_{p} = 1 %$ , with $t_{EML} = 24$ –25 nm under both operating conditions. Multi-objective Particle Swarm Optimization (MOPSO) identified a trade-off region comparable to that obtained by NSGA-II, providing a cross-algorithm consistency check of the reported numerical results. The proposed methodology thus establishes a physically grounded link between device design, the spatial redistribution of excitons, the modeled loss pathways, and the macroscopic performance of OLEDs, thereby providing an interpretable framework for the multi-objective optimization of fluorescent OLEDs prior to fabrication.
Open Access
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Cited by 1
- 19 May 2026
- Published by MDPI AG in Electronics
Multi-Objective Optimization of the Electro-Optical Performances of Fluorescent OLEDs Based on Defect-State and ETL/HTL Thickness Analysis
by Mohammed El Halaoui, Mustapha El Halaoui, Lahcen Amhaimar, Adel Asselman, Laurent Canale, Bousselham Samoudi
In scientific research, the optimization of organic light-emitting diodes (OLEDs) is generally achieved through a lengthy and expensive experimental process as new ideas and configurations are tested on real devices. Electro-optical simulation allows for the rapid evaluation of key performance parameters of device structures, thus reducing manufacturing time and costs. This paper presents an original contribution to the electro-optical modeling and optimization of multilayer OLED devices using the Non-dominated Sorting Genetic Algorithm II (NSGA-II). This optimization explicitly incorporates defect states within the ITO/NPB/Alq₃:C545T/Alq₃/LiF-Al structure. The simulated model is calibrated using experimental data by fitting the trap state distribution. The Pareto front resulting from the multi-objective optimization identifies a set of non-dominated configurations, including an optimal intermediate structure defined by an electron transport layer (ETL) thickness of approximately 42 nm and a hole transport layer (HTL) thickness of approximately 53 nm. This configuration leads to a limited reduction of 1.75–2% in current efficiency ( $η_{c}$ ) while offering a remarkable improvement of 23–30% in power efficiency ( $η_{p}$ ) compared to the extreme configurations of the optimal Pareto set. Thus, this solution represents an optimal Pareto trade-off between high current efficiency and improved power efficiency. This paper shows that combining defect modeling and thickness optimization provides a reliable framework for the electro-optical optimization of OLED devices. Future work will extend this approach to spectral and colorimetric analysis.
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Google Scholar
- 19 May 2026
- Published by MDPI AG in Electronics
Open Access
Multi-Objective Optimization of the Electro-Optical Performances of Fluorescent OLEDs Based on Defect-State and ETL/HTL Thickness Analysis
by Mohammed El Halaoui, Mustapha El Halaoui, Lahcen Amhaimar, Adel Asselman, Laurent Canale, Bousselham Samoudi
In scientific research, the optimization of organic light-emitting diodes (OLEDs) is generally achieved through a lengthy and expensive experimental process as new ideas and configurations are tested on real devices. Electro-optical simulation allows for the rapid evaluation of key performance parameters of device structures, thus reducing manufacturing time and costs. This paper presents an original contribution to the electro-optical modeling and optimization of multilayer OLED devices using the Non-dominated Sorting Genetic Algorithm II (NSGA-II). This optimization explicitly incorporates defect states within the ITO/NPB/Alq₃:C545T/Alq₃/LiF-Al structure. The simulated model is calibrated using experimental data by fitting the trap state distribution. The Pareto front resulting from the multi-objective optimization identifies a set of non-dominated configurations, including an optimal intermediate structure defined by an electron transport layer (ETL) thickness of approximately 42 nm and a hole transport layer (HTL) thickness of approximately 53 nm. This configuration leads to a limited reduction of 1.75–2% in current efficiency ( $η_{c}$ ) while offering a remarkable improvement of 23–30% in power efficiency ( $η_{p}$ ) compared to the extreme configurations of the optimal Pareto set. Thus, this solution represents an optimal Pareto trade-off between high current efficiency and improved power efficiency. This paper shows that combining defect modeling and thickness optimization provides a reliable framework for the electro-optical optimization of OLED devices. Future work will extend this approach to spectral and colorimetric analysis.
Cited by 1
Open Access
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Google Scholar
Cited by 5
- 8 January 2024
- Published by MDPI AG in Electronics
Optically Transparent Honeycomb Mesh Antenna Integrated into OLED Light Source
by Mustapha El Halaoui, Pascal Dupuis, Olivier Pigaglio, Adel Asselman, Georges Zissis, Laurent Canale
The co-integration of antennas with lighting sources appears as an effective way to distribute broadband networks closer to users, lowering interference and transmitted power, as well as to reduce energy consumption in future lighting systems. We here present an original contribution to the implementation of transparent and invisible antennas with OLED light sources. To validate the proposed approach, the honeycomb mesh technique was used, and an optical transparency of 75.4% was reached. The transparent mesh antenna was compared with the non-transparent full-metal antenna in terms of radio-electrical parameters. Our prototype was designed using copper films deposited on a glass substrate. The simulation results of the S-parameters and the radiation patterns were validated against measurements performed in an anechoic chamber. The directivity and gain obtained were $6.67$ dBi and $4.86$ dBi at $5.16$ $G$ $Hz$ , respectively. To study the effect of antenna integration with OLEDs, optical and photometric characterizations with and without the antenna were measured, and the colorimetric parameters were then treated using the IES TM-30-18 standard.
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- 8 January 2024
- Published by MDPI AG in Electronics
Open Access
Optically Transparent Honeycomb Mesh Antenna Integrated into OLED Light Source
by Mustapha El Halaoui, Pascal Dupuis, Olivier Pigaglio, Adel Asselman, Georges Zissis, Laurent Canale
The co-integration of antennas with lighting sources appears as an effective way to distribute broadband networks closer to users, lowering interference and transmitted power, as well as to reduce energy consumption in future lighting systems. We here present an original contribution to the implementation of transparent and invisible antennas with OLED light sources. To validate the proposed approach, the honeycomb mesh technique was used, and an optical transparency of 75.4% was reached. The transparent mesh antenna was compared with the non-transparent full-metal antenna in terms of radio-electrical parameters. Our prototype was designed using copper films deposited on a glass substrate. The simulation results of the S-parameters and the radiation patterns were validated against measurements performed in an anechoic chamber. The directivity and gain obtained were $6.67$ dBi and $4.86$ dBi at $5.16$ $G$ $Hz$ , respectively. To study the effect of antenna integration with OLEDs, optical and photometric characterizations with and without the antenna were measured, and the colorimetric parameters were then treated using the IES TM-30-18 standard.
Cited by 5
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Google Scholar
- 28 June 2022
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Warm and Neutral White OLEDs Aging Comparison Studies under Electrical and Thermal Stress
by Mustapha El Halaoui, Pascal Dupuis, Andrea Al Haddad, Adel Asselman, Georges Zissis, Laurent Canale
Nowadays, Organic Light Emitting Diode (OLED) panels are widely used for displays from smartphone to TV or tablets but, due to numerous qualities (high color rendering index, high efficiency, bendable, no glare, etc.), this kind of light sources is more and more seen as the next generation of wide usage light source. If the color temperature shows well-known effects on the human circadian cycle which should lead to specific usage, this color temperature is due to the composition of the emissive layer. This paper presents for the first time a comparative study of luminance and impedance evolution between neutral and warm white large-area OLED panels aged under thermal and electrical stress. The results show that warm white OLEDs developed the fastest degradation compared to neutral white families. Therefore, the Correlated Color Temperature (CCT) is an important factor in the aging of OLEDs, like current and temperature.
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- 28 June 2022
- Published by Institute of Electrical and Electronics Engineers (IEEE)
Warm and Neutral White OLEDs Aging Comparison Studies under Electrical and Thermal Stress
by Mustapha El Halaoui, Pascal Dupuis, Andrea Al Haddad, Adel Asselman, Georges Zissis, Laurent Canale
Nowadays, Organic Light Emitting Diode (OLED) panels are widely used for displays from smartphone to TV or tablets but, due to numerous qualities (high color rendering index, high efficiency, bendable, no glare, etc.), this kind of light sources is more and more seen as the next generation of wide usage light source. If the color temperature shows well-known effects on the human circadian cycle which should lead to specific usage, this color temperature is due to the composition of the emissive layer. This paper presents for the first time a comparative study of luminance and impedance evolution between neutral and warm white large-area OLED panels aged under thermal and electrical stress. The results show that warm white OLEDs developed the fastest degradation compared to neutral white families. Therefore, the Correlated Color Temperature (CCT) is an important factor in the aging of OLEDs, like current and temperature.
Open Access
Website
Google Scholar
Cited by 10
- 28 December 2020
- Published by MDPI AG in Proceedings
Dual-Band 28/38 GHz Inverted-F Array Antenna for Fifth Generation Mobile Applications
by Mustapha El Halaoui, Laurent Canale, Adel Asselman, Georges Zissis
The development of 5G (fifth generation) mobile communication systems was initiated to meet the expected need for higher data rates. In this article, a new 28/38 GHz dual-band “inverted-F” array antenna for 5G applications is proposed. This antenna can be integrated in OLEDs (Organic Light Emitting Diodes) panels which can be used both for lighting or display. This 5G antenna, composed of 32 elements, has the advantage of a dual-band and compact structure. Each element of the array antenna has the shape of an “inverted-F” antenna. This array antenna can cover the 28 GHz band (27.94–28.83 GHz) and the 38 GHz band (37.97–38.96 GHz) with mutual coupling between the elements less than −35 dB. The characteristics of the end fire radiation beams were obtained by employing an array of 32 “inverted-F” antenna elements on the upper and lower portions of the PCB (Printed Circuit Board). The suggested design has a gain of approximately 16.52 dB at 28.38 GHz and 15.35 dB at 38.49 GHz, which is suitable for 5G mobile communications.
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- 28 December 2020
- Published by MDPI AG in Proceedings
Open Access
Dual-Band 28/38 GHz Inverted-F Array Antenna for Fifth Generation Mobile Applications
by Mustapha El Halaoui, Laurent Canale, Adel Asselman, Georges Zissis
The development of 5G (fifth generation) mobile communication systems was initiated to meet the expected need for higher data rates. In this article, a new 28/38 GHz dual-band “inverted-F” array antenna for 5G applications is proposed. This antenna can be integrated in OLEDs (Organic Light Emitting Diodes) panels which can be used both for lighting or display. This 5G antenna, composed of 32 elements, has the advantage of a dual-band and compact structure. Each element of the array antenna has the shape of an “inverted-F” antenna. This array antenna can cover the 28 GHz band (27.94–28.83 GHz) and the 38 GHz band (37.97–38.96 GHz) with mutual coupling between the elements less than −35 dB. The characteristics of the end fire radiation beams were obtained by employing an array of 32 “inverted-F” antenna elements on the upper and lower portions of the PCB (Printed Circuit Board). The suggested design has a gain of approximately 16.52 dB at 28.38 GHz and 15.35 dB at 38.49 GHz, which is suitable for 5G mobile communications.
Cited by 10
Open Access
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Google Scholar
Cited by 42
- 1 November 2019
- Published by Elsevier in Energy Reports
Non-linear and intelligent maximum power point tracking strategies for small size wind turbines: Performance analysis and comparison
by A.E. Yaakoubi, L. Amhaimar, K. Attari, M.H. Harrak, M.E. Halaoui, A. Asselman
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- 1 November 2019
- Published by Elsevier in Energy Reports
Open Access
Non-linear and intelligent maximum power point tracking strategies for small size wind turbines: Performance analysis and comparison
by A.E. Yaakoubi, L. Amhaimar, K. Attari, M.H. Harrak, M.E. Halaoui, A. Asselman
Cited by 42
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- 21 June 2019
- Published by Springer Nature in Lecture Notes in Computer Science
Design of a New Patch Antenna Using EBG Structures and Superstarte Operating in the Ku-Band for 5G Cellular Networks
by Sanae Dellaoui, Adel Asselman, Saida Ahyoud, Abdelmoumen Kaabal, Loubna Rmili, Mustapha Elhalaoui
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- 21 June 2019
- Published by Springer Nature in Lecture Notes in Computer Science
Design of a New Patch Antenna Using EBG Structures and Superstarte Operating in the Ku-Band for 5G Cellular Networks
by Sanae Dellaoui, Adel Asselman, Saida Ahyoud, Abdelmoumen Kaabal, Loubna Rmili, Mustapha Elhalaoui
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Cited by 1
- 21 June 2019
- Published by Springer Nature in Lecture Notes in Computer Science
High Gain Metallic Electromagnetic Band Gap Antenna for WLAN Applications
by Loubna Rmili, Adel Asselman, Abdelmoumen Kaabal, Sanae Dellaoui, Mustapha El Halaoui
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- 21 June 2019
- Published by Springer Nature in Lecture Notes in Computer Science
High Gain Metallic Electromagnetic Band Gap Antenna for WLAN Applications
by Loubna Rmili, Adel Asselman, Abdelmoumen Kaabal, Sanae Dellaoui, Mustapha El Halaoui
Cited by 1
Open Access
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Cited by 11
- 1 January 2019
- Published by Elsevier in Procedia Manufacturing
Peak-to-Average Power Ratio Reduction Using New Swarm Intelligence Algorithm in OFDM Systems
by Amhaimar Lahcen, Attari Kamal, Halaoui Mustapha, Elyaakoubi Ali, Ahyoud Saida, Asselman Adel
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- 1 January 2019
- Published by Elsevier in Procedia Manufacturing
Open Access
Peak-to-Average Power Ratio Reduction Using New Swarm Intelligence Algorithm in OFDM Systems
by Amhaimar Lahcen, Attari Kamal, Halaoui Mustapha, Elyaakoubi Ali, Ahyoud Saida, Asselman Adel
Cited by 11
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- 1 January 2019
- Published by IGI Global Scientific Publishing
1D Electromagnetic Band Gap Analysis and Applications
by Abdelmoumen Kaabal, Mustapha El Halaoui, Saida Ahyoud, Adel Asselman
In this chapter, a detailed study of the one-dimension electromagnetic band gap (1D-EBG) structures and their application in a directional antenna design are presented. To improve the ability and analyze and understand the behavior of 1D-EBG, three techniques of analysis are developed. The results show that the periodicity of the dielectric permittivity makes it possible to stop the waves propagation in certain frequency bands. A comparison between the different methods shows an excellent agreement. An evolution of the transmission coefficient of a structure consisting of six layers with a cavity of thickness equal a wavelength in the middle of the structure, shows that there is a peak of transmission which is formed at the center frequency of the band gap and reflects a resonance phenomenon. This phenomenon of frequency filtering is exploited for the design of a directive EBG antenna by introducing an excitation to the cavity center.
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- 1 January 2019
- Published by IGI Global Scientific Publishing
1D Electromagnetic Band Gap Analysis and Applications
by Abdelmoumen Kaabal, Mustapha El Halaoui, Saida Ahyoud, Adel Asselman
In this chapter, a detailed study of the one-dimension electromagnetic band gap (1D-EBG) structures and their application in a directional antenna design are presented. To improve the ability and analyze and understand the behavior of 1D-EBG, three techniques of analysis are developed. The results show that the periodicity of the dielectric permittivity makes it possible to stop the waves propagation in certain frequency bands. A comparison between the different methods shows an excellent agreement. An evolution of the transmission coefficient of a structure consisting of six layers with a cavity of thickness equal a wavelength in the middle of the structure, shows that there is a peak of transmission which is formed at the center frequency of the band gap and reflects a resonance phenomenon. This phenomenon of frequency filtering is exploited for the design of a directive EBG antenna by introducing an excitation to the cavity center.

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