Frequency responses of modulated electroluminescence(EL)of light-emitting diodes were measured using a testing setup.With increasing frequency of the ac signal,the relative light intensity(RLI)clearly decreases.Furthe...Frequency responses of modulated electroluminescence(EL)of light-emitting diodes were measured using a testing setup.With increasing frequency of the ac signal,the relative light intensity(RLI)clearly decreases.Furthermore,a peculiar asynchrony between the RLI and ac small-signal is observed.At frequencies higher than 10 kHz,the RLI clearly lags behind the ac signal and the absolute value of the lagging angle is nearly proportional to the signal frequency.Using the classical recombination model of light-emitting diodes under ac small-signal modulation,these abnormal characteristics of modulated EL can be clearly explained.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.60876035,50901050,11004148 and 11004149.
文摘Frequency responses of modulated electroluminescence(EL)of light-emitting diodes were measured using a testing setup.With increasing frequency of the ac signal,the relative light intensity(RLI)clearly decreases.Furthermore,a peculiar asynchrony between the RLI and ac small-signal is observed.At frequencies higher than 10 kHz,the RLI clearly lags behind the ac signal and the absolute value of the lagging angle is nearly proportional to the signal frequency.Using the classical recombination model of light-emitting diodes under ac small-signal modulation,these abnormal characteristics of modulated EL can be clearly explained.
