大尺寸LED晶片Efficiency Droop之光電熱效應研究

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大尺寸LED晶片Efficiency Droop之光電熱效應研究

Optical-Electrical-Thermal Effect on Efficiency Droop in Large Size Light Emitting Diode Chips

蕭仲博 , Masters　　Advisor：陳志臣　　

繁體中文;英文

氮化鎵；發光二極體；大尺寸晶片；效率衰退； GaN ； LED ； large size chip ； Efficiency Droop

Abstract │ Reference (79) │ Altmetrics

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Recently, InGaN/GaN multi-quantum well (MQW) of blue or green light emitting diodes (LEDs) has attracted great interest in solid-state lighting.  However, the efficiency droop restricts LEDs ability under the high power operation which is the critical issue.  The droop makes the internal quantum efficiency has a great drop. In this study, two commercial LED structures are investigated which are vertical and lateral chip respectively.  The finite element method (FEM) and Monte Carlo statistics method are applied to the optical-electrical-thermal coupled numerical model.  Through the current and energy conservation, we can define every carrier behavior in active layer and heat generation.  We also can obtain the light source from the calculated IQE to start the ray tracing.  Then we analyze the interaction of current spreading effect on electrical efficiency, internal quantum efficiency, light extraction efficiency, junction temperature and light output power.
The experiment shows the more nonlinear increase of junction temperature and severer droop in lateral structure.  By the simulation, the carrier leakage is the main mechanism from the nature of materials which induces the droop.  Furthermore, current crowding also affects the quantum efficiency.  In fact, current spreading is the key to drive the droop from external. 
In the final part, by the optical simulation, the light extraction efficiency also plays an important role of efficiency droop, which is caused by the absorption effect.  Although the current crowding of the vertical structure degree is lower, the stronger absorption by n-pad results in the greater efficiency droop, even the absorption coefficient is smaller than lateral structure.  Based on these analyses of the simulation, the better LED device is expected to improve.

Reference ( 79 ) 〈TOP〉

4.S.J. Chang, T.K. Lin, Y.Z. Chiou, B.R. Huang, S.P. Chang, C.M. Chang, Y.C. Lin and C.C. Wong, “ZnSe based white light emitting diode on homoepitaxial ZnSe substrate” IET Optoelectron., 1, 39–41 (2007)
連結：
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連結：
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連結：
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連結：
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連結：

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