摘要
搭建由半导体制冷片和光谱仪组成的LED变温发光特性测试系统，使用多通道温度测试仪记录芯片工作温度，得到LED芯片在30-80℃范围内的发光特性与温度的关系。结果表明：在输入电流恒定时，随着芯片材料温度的不断升高，LED的电功率和光功率降低，LED光效下降趋势明显；同时由于材料禁带宽度减小， GaN LED的蓝光峰值波长发生红移；通过上述测试，利用数值拟合方式得到了芯片发光特性与温度之间的函数关系。
A temperature changing LED spectral measurement system is built, which consisted of semiconductor refrigerating piece and spectrometers,using multi-channel temperature tester to test the chip′s temperature. The relationship between LED spectrum and temperature is measured from 30℃to 80℃. The tested result shows that when the input current is constant, with the temperature increasing, LED electrical power, luminous flux and electro-optic efficiency are reduced. GaN LED peak wavelength is red shift due to band gap diminishing. The function of temperature and light attenuation is obtained by numerical fitting test results.
出处
《天津工业大学学报》
CAS
北大核心
2016年第4期85-88,共4页
Journal of Tiangong University
基金
国家自然科学基金青年基金项目(11404239)
天津市自然科学基金青年基金项目(14JCQNJC01000)
关键词
LED光功率
光效
温度
峰值波长
LED luminous power
luminous efficacy
temperature
peak wavelength
