Growth of single-crystalline rutile TiO2 nanorod arrays on GaN light-emitting diodes with enhanced light extraction
- 24 January 2012
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 22 (9) , 3916-3921
Abstract
TiO2 is a wide band gap semiconductor with important applications in photovoltaic cells and photocatalysis. In this paper, single-crystalline rutileTiO2 nanorod arrays were fabricated on the GaN based light emitting diodes (LEDs) with a TiO2 seed layer by an acid hydrothermal process. The morphologies and the crystallinity of the rutileTiO2 nanorod arrays on GaN wafer were characterized by scanning electron microscopy, high-resolution transmission electron microscopy and X-ray diffraction. The optical properties of surface-textured TiO2/GaN were measured and analyzed by photoluminescence. The influence and dependence of the TiO2 nanorod array with the different densities and diameters on the light output of the fabricated GaN wafers were investigated. The light extraction efficiency of GaN LEDs was enhanced by the single-crystalline rutileTiO2 nanorod array, which showed an eight-fold increase in photoluminescence intensity compared to the normal planar surface. The mechanisms for the enhanced light output of GaN LEDs by the single-crystalline rutileTiO2 nanorod arrays were discussed.Keywords
This publication has 38 references indexed in Scilit:
- UV sensor based on TiO2 nanorod arrays on FTO thin filmSensors and Actuators B: Chemical, 2011
- Control synthesis of rutile TiO2 microspheres, nanoflowers, nanotrees and nanobelts via acid-hydrothermal method and their optical propertiesCrystEngComm, 2011
- Nanoheterostructures on TiO2 nanobelts achieved by acid hydrothermal method with enhanced photocatalytic and gas sensitive performanceJournal of Materials Chemistry, 2011
- Enhancement of Light Extraction From Resonant Cavity Light-Emitting Diodes Using a 2-D Grating Embossed in TiO$_{2}$ Sol-GelIEEE Photonics Technology Letters, 2009
- Growth of Oriented Single-Crystalline Rutile TiO2 Nanorods on Transparent Conducting Substrates for Dye-Sensitized Solar CellsJournal of the American Chemical Society, 2009
- Photonic crystal light-emitting diodes fabricated by microsphere lithographyNanotechnology, 2008
- Light‐Extraction Enhancement of GaInN Light‐Emitting Diodes by Graded‐Refractive‐Index Indium Tin Oxide Anti‐Reflection ContactAdvanced Materials, 2008
- Enhanced light output of an InGaN/GaN light emitting diode with a nano-roughened p-GaN surfaceNanotechnology, 2005
- Growth of Submicrometer-Scale Rectangular Parallelepiped Rutile TiO2Films in Aqueous TiCl3Solutions under Hydrothermal ConditionsJournal of the American Chemical Society, 2004
- Increase in the extraction efficiency of GaN-based light-emitting diodes via surface rougheningApplied Physics Letters, 2004