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Packaging Light Extraction Efficiency Enhancement of LED Array Packaging with Various Micro-structures

Author: WuDan
Tutor: LiuSheng
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: LED array Package light extraction efficiency Microstructures
CLC: TN312.8
Type: Master's thesis
Year: 2011
Downloads: 60
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Abstract


The light - emitting diode (LED) is widely used because of its high lumen efficiency and energy - saving and environmental protection advantages , integrated dozen or even hundreds of LED chip high power LED array package is a major development trend of LED packaging . However, this LED array package encapsulates the light extraction efficiency is low while the application is limited. In this paper, an LED array package of silica gel surface add micro- structure to improve light extraction efficiency of the LED array package . By simulation analysis of the feasibility and effectiveness of add light surface micro - structure to improve light extraction efficiency of encapsulation silicone LED array package . Analyzing and simplify the problem , based on the established numerical model, and to compare the light extraction efficiency of the LED array package of the smooth surface and the surface with a micro structure in both cases . Mainly discussed the diameter and depth of the seven micro-structure two structural parameters, as well as the surface of the planar area in the package on silica gel changes in the proportion of the change of the light extraction efficiency of the LED array package . Simulation results show that break away from a plurality of directions within the two-dimensional structure of the total reflection phenomenon than the one-dimensional striped structure in improving the light extraction efficiency of the LED package better , wherein the inverted ball crown structure on the improvement of the level of chips of the light extraction efficiency of the LED array package up to 47.04% of vertical chip LED array can be increased by 36.07% . Inverted conical structure with inverted are four pyramid structure for the encapsulation of the LED array light extraction efficiency to raise the level similar increased by 44.71% and 45.26% , respectively, for the level of chip LED array ; the vertical chip LED array can be increased by 31.73% and 31.93% . In addition, on the LED array package surface introduced inverted positive quadrangular structure of the station with the round station also can effectively improve the efficiency of LED array package light extraction level chip LED array can improve 45.77% and 46.18 % , 34.01% for vertical chip LED array and 33.71% , respectively . Simulation analysis based on experimental studies of surface micro- structure of the light extraction efficiency of the LED array package . Experimental results show that the LED level chip arrays , inverted spherical cap , cylindrical groove V-shaped groove structure can be respectively increased by 12.13% , 10.23% and 7.44% , respectively , of the experimental results with the simulation results of the same structure is more consistent .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Semiconductor diode > Diodes: structure and performance > Light-emitting diodes
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