White‐light emission from Y 2 SiO 5 :Ce 3+ , Tb 3+ and Sr 2 Si 5 N 8 :Eu 2+ phosphor blends: a predictive model

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Abstract
In recent years, there has been an increasing interest in developing multifunctional materials that can be used in different areas, such as artificial lighting. White light‐emitting diodes offer the possibility of efficient, safe, and reliable solid‐state lighting. This study presents a synthesis and characterisation process of a white‐light emitting phosphor based on the combination of rare earth‐activated Y 2 SiO 5 :Ce 3+ , Tb 3+ (YSO) and Sr 2 Si 5 N 8 :Eu 2+ (SSN) phosphors. The YSO phosphor was prepared by combustion synthesis, whereas the SSN phosphor was prepared by solid‐state reaction under N 2 /H 2 atmosphere. Photoluminescence measurements showed the contribution of a broad‐band emission of Ce 3+ ions located in the blue region of the electromagnetic spectrum, a well‐defined green emission of Tb 3+ ions with the main peak located at λ Em = 545 nm in the YSO phosphor, and a broad‐band emission in the red region due to Eu 2+ ions in the SSN phosphor. It is worth mentioning that excitation wavelength was in long UV radiation at 360 nm. In addition, a predictive model simulating and modelling the rare earths’ molar percentages to approximate to the D65 white light chromaticity coordinates is presented.

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