Current crowding effect on the ideality factor and efficiency droop in blue lateral InGaN/GaN light emitting diodes

2010 ◽  
Vol 97 (25) ◽  
pp. 251110 ◽  
Author(s):  
V. K. Malyutenko ◽  
S. S. Bolgov ◽  
A. D. Podoltsev
Keyword(s):  
Ideality Factor ◽  
Light Emitting Diodes ◽  
Efficiency Droop ◽  
Current Crowding ◽  
Crowding Effect ◽  
Light Emitting

Use of anisotropic laser etching to the top n-GaN layer to alleviate current-crowding effect in vertical-structured GaN-based light-emitting diodes

2007 ◽  
Vol 90 (4) ◽  
pp. 041115 ◽  
Author(s):  
Tron-Min Chen ◽  
Shui-Jinn Wang ◽  
Kai-Ming Uang ◽  
Shiue-Lung Chen ◽  
Wei-Chih Tsai ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Current Crowding ◽  
Crowding Effect ◽  
Laser Etching ◽  
Light Emitting

scholarly journals Numerical Simulation on Electrical-Thermal Properties of Gallium-Nitride-Based Light-Emitting Diodes Embedded in Board

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Xing-ming Long ◽  
Rui-jin Liao ◽  
Jing Zhou
Keyword(s):  
Finite Element ◽  
Gallium Nitride ◽  
Indium Tin Oxide ◽  
Light Emitting Diodes ◽  
Thermal Characteristics ◽  
Junction Temperature ◽  
Current Crowding ◽  
Total Thermal Resistance ◽  
Light Emitting ◽  
Packaging Structure

The electrical-thermal characteristics of gallium-nitride- (GaN-) based light-emitting diodes (LED), packaged by chips embedded in board (EIB) technology, were investigated using a multiphysics and multiscale finite element code, COMSOL. Three-dimensional (3D) finite element model for packaging structure has been developed and optimized with forward-voltage-based junction temperatures of a 9-chip EIB sample. The sensitivity analysis of the simulation model has been conducted to estimate the current and temperature distribution changes in EIB LED as the blue LED chip (substrate, indium tin oxide (ITO)), packaging structure (bonding wire and chip numbers), and system condition (injection current) changed. This method proved the reliability of simulated results in advance and useful material parameters. Furthermore, the method suggests that the parameter match on Shockley's equation parameters, Rs, nideal, and Is, is a potential method to reduce the current crowding effect for the EIB LED. Junction temperature decreases by approximately 3 K to 10 K can be achieved by substrate thinning, ITO, and wire bonding. The nonlinear-decreasing characteristics of total thermal resistance that decrease with an increase in chip numbers are likely to improve the thermal performance of EIB LED modules.

Sign in / Sign up

Export Citation Format

Share Document