Effect of TransferredAnsferred Submount Materials on Properties of GaN-Based LED Chips Grown on Si Substrate

一种新型高效的多层荧光粉层白光led封装结构

“…This kind of structure improves not only the efficiency but also the lifetime of LEDs. For the phosphor layer away from the LED chip, the heat generated by the LED chip only transfer to the substrate [7] instead of the phosphor. The probability of a light ray emitted by the phosphor hitting the low reflective LED chip directly is small.…”

光子晶体氮化镓发光二极管发光提取特性研究

“…Most of spontaneous emission was trapped in the active layer performing as guided modes and delocalized modes [2] . Various kinds of methods including surface roughness, flip chip [3,4] , and substrate mirror [5,6] were used to enhance the light extraction efficiency. The introduction of two-dimensional (2D) photonic crystal (PC) structure on top surface of GaN LEDs is a novel method to increase light extraction efficiency.…”