光谱分布可调光源的LED筛选研究

Screening of LED for spectrum-tunable light source

针对LED光谱分布可调光源对LED寿命以及光谱一致性的要求,对可见光和近红外波段的29种LED分别进行200h的电流加速老化试验,并提出LED光谱一致性筛选算法。老化试验结果表明:峰值波长为385nm、400nm和420-1nm 3种LED的辐射通量平均衰减分别为24.8%、10.7%和25.6%,不能用于LED光谱分布可调光源;剩余的26种LED的辐射通量平均衰减量均低于3.5%,可作为光谱分布可调光源的内部光源。LED光谱一致性筛选算法以LED光谱数据为基础,计算同类LED间的相对光谱偏差,26种LED的相对光谱偏差均小于4.5%,保证了所筛选出LED的光谱一致性。

In order to meet the requirements for lifetime and spectrum consistency of LED used in LED-based spectrum-tunable light source, 29 kinds of LEDs were seasoned for 200 hours separately under the accelerated current condition, and a spectral consistency screening algorithm was proposed. Results of ageing test indicate that the values of radiant flux attenuation of 3 kinds of LEDs, whose peak wavelengths are 385 nm, 400 nm and 420-1 nm, are 24.8%, 10.7% and 25.6% ,respectively, so they are not suitable for LED-based spectrum-tunable light source. The values of radiant flux attenuation of the remaining 26 kinds of LEDs are all below 3.5%, and they are all suitable for LED-based spectrum-tunable light source. The spectral consistency screening algorithm is based on the LED＇s spectroscopic data, and the relative spectral deviation among the same kinds of LEDs can be calculated. The relative spectral deviations of 26 kinds of LEDs are all below 4.5 %, the spectral consistency of the screened LED can be ensured.