发光二极体接面温度量测.PDF

度量 李 立理 立了量度論 理量立量 量流(Measurement Current IM) 度數 (Temperature Coefficient Of Junction Voltage K ) 冷(Cooling time t ) j C (Heating Time t )參數立 H 藍 立 度量了理量度 度度 I LED Junction Temperature Measurement student Yi-Hong Chen Advisors Dr. Wei-I Lee Department Institute of Electrophysics National Chiao Tung University ABSTRACT In this study, we have set up a system to measure LED junction temperature. In this thesis, we first introduce the operation principle of the experiment, the establishment of the system, and the selection of the measurement conditions. In the selection of the measurement conditions, four important parameters are included measurement current (IM), temperature coefficient of junction voltage (K ), cooling time(t ), heating j C time (tH). Then, we follow the selection rule of the system to choose these four parameters and prove them from the result of the experiments. We find the blue light-emitting diodes, behave pretty much as we have predicted. But the red light-emitting diodes, maybe due to its structure, behave differently from the blue light-emitting diodes. In the junction temperature measurements, we get reasonable curves and also confirm the accuracy of the system’s measurements further. In addition, in compa