Indium-Induced Effect on Polarized Electroluminescence from InGaN/GaN MQWs Light Emitting Diodes

Autor:	Tao Ren-Chun, Jia Chuan-Yu, Ruan Jun, Yu Tong-Jun, Wang Zhan-Guo, Zhang Guo-Yi
Rok vydání:	2009
Předmět:	Photoluminescence Materials science business.industry General Physics and Astronomy chemistry.chemical_element Electroluminescence law.invention Semiconductor chemistry law Quantum dot Optoelectronics Luminescence business Quantum well Indium Light-emitting diode
Zdroj:	Chinese Physics Letters. 26:087802
ISSN:	1741-3540 0256-307X
DOI:	10.1088/0256-307x/26/8/087802
Popis:	Polarization-resolved edge-emitting electroluminescence (EL) studies of InGaN/GaN MQWs of wavelengths from near-UV (390 nm) to blue (468 nm) light-emitting diodes (LEDs) are performed. Although the TE mode is dominant in all the samples of InGaN/GaN MQW LEDs, an obvious difference of light polarization properties is found in the InGaN/GaN MQW LEDs with different wavelengths. The polarization degree decreases from 52.4% to 26.9% when light wavelength increases. Analyses of band structures of InGaN/GaN quantum wells and luminescence properties of quantum dots imply that quantum-dot-like behavior is the dominant reason for the low luminescence polarization degree of blue LEDs, and the high luminescence polarization degree of UV LEDs mainly comes from QW confinement and the strain effect. Therefore, indium induced carrier confinement (quantum-dot-like behavior) might play a major role in the polarization degree change of InGaN/GaN MQW LEDs from near violet to blue.
Databáze:	OpenAIRE
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