手机白光LED闪光灯的光谱分析

Study on Flash Lamp by White LED of Mobile Phone Using Spectra Analysis

使用WGD-3型组合式多功能光栅光谱仪测量了11款不同型号的手机摄像闪光灯的白光LED光谱.其光谱均由400～460nm范围内的蓝光和460～610范围内的激发光波段组成,蓝光波段强度较大,激发光波段强度偏低.由于不同型号的手机闪光灯LED在制作材料和工艺上存在差异,导致其光谱略有不同.蓝光波段中,440nm的蓝光对人眼伤害最大,1-4号手机蓝光波段最强峰未能避开440nm的中心波长. 3号手机在556nm附近的绿光波峰最明显.利用蓝光中心波长的强度比激发光中心波长的强度描述蓝光在LED光谱中的相对强度,研究显示5号手机的蓝光相对强度最强.蓝光波段的强度是值得关注的一个重要问题,在满足白光视觉的条件下,应尽量减少蓝光的强度从而降低蓝光对人眼的损害.

The spectra of flash lamp by white LED of eleven mobile phone were obtained by combined type multifunetion grating spectrometer （model number：WGD -3 ）. The spectrum was composed of blue light band in the 400 -460nm range and excitation band in the 460 -610 range. The intensity of the blue band was strong, and the excitation light band was low. Due to the differences in material and technology of differ- ent types of mobile phone flash lamp LED, the spectra were slightly different. In the range of blue light band, the band at 440nm was the serious harm to the human eye, No. 1 -4 mobile phone could not avoid the blue light strongest peak at central wavelength of 440nm. The green band near at 556nm was the most obvious of NO. 3 mobile phone. The relative intensity was defined as the ratio of the intensity of the central wavelength of the blue light and the intensity of the center wavelength of the excited light. The relative inten- sity of NO. 5 mobile phone was stronger than other mobile phone. The intensity of the blue band was an im- portant parameter, when satisfying the white light vision, we should minimize the intensity of blue light and reduce the injure of blue light.