The possibility of evaluating the quality of heterojunction LEDs by the level of the threshold current (glow current start) has been considered. The block diagram of the setup operation of measuring the LEDs threshold current has been presented. The principle of the setup operation is to specify the linearly increasing current through the LED by the precision source, to measure the signal proportional to the LED optical radiation power by the highly sensitive photodetector based on the high-speed photodiode and low-noise transimpedance amplifier and to compute the value of the threshold current in the Mathcad program. The results of the sample measurements of the threshold current of various types of LEDs, illustrating a wide variation of parameters of the sampling distribution of LEDs by the level of the threshold current, have been presented.
Oleg A. Radaev
Ulyanovsk Branch of Kotel’nikov Institute of Radio Engineering and Electronics of Russian Academy of Sciences, Ulyanovsk, Russia; Ulyanovsk State Technical University, Ulyanovsk, Russia.
Ilya V. Frolov
Ulyanovsk Branch of Kotel’nikov Institute of Radioengineering and Electronics of Rus-sian Academy of Sciences, Ulyanovsk, Russia
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