基于电子实验室平台下的LED发光优化

Optimization of LED Luminescence Based on Electronic Laboratory Platform

结合表面等离子(SP)的特性,研制了砷化镓材料沉积金膜以及Ga N发光层模型,通过金膜-介质间产生的SP增强作用来显著提高LED的出光效率。理论上采用SP的周期光栅传播与耦合强度模型,分析得出SP对发光效率放大倍数都能满足耦合辐射与发射源自身辐射效率的比。发光实验结果得出:通过金属膜结构的沉积实现了反射率显著下降,结果能够将一部分损耗能量变化为光发射,改进模型能够显著提高发光效率。参数分析得出:模型设计为占空比0.81左右光栅周期能够实现吸收率最大,此时能够较好地实现SP增强LED出光效果;SP的增强作用实现了用于显著改善弱光致发光的发光效率和非线性过程,且非线性过程能够用来检测不同衬底介质少量辐射。

At present the LED research still mainly LED external quantum efficiency as the main direction. Combined with the characteristics of the surface plasma （SP） , gallium arsenide material deposition of gold film and GaN light- emitting layer model were developed. Through SP enhanced function which yields between gold film and medium, the efficiency of LED light is significantly improved. Theoretic analysis is used the cycle of SP grating propagation and the coupling strength model, and the conclusion is that SP magnification luminous efficiency can meet the coupled radiation and emission of radiation efficiency. Luminous experimental results show that the structure of the metal film deposition can achieve a significant reduction in the reflectivity, then partial loss of energy changes to light emission, and enhances luminous efficiency. By analyzing parameters, the absorption rate reaches its largest value as the duty ratio is designed around 0.81, it can realize better effect of LED light enhanced by the SP; The enhancement effect of SP achieves to improve the weak photoluminescence, and illustrates that the luminescence of LED is nonlinear process. The nonlinear process can be used to detect different substrate medium with small amounts of radiation.