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Influence of High Excitation Intensity on GaP∶N Luminescence Spectra

KANG Xiu-ying, YANG Xi-zhen, WANG Ya-fei, WANG You-lin (Center of Analysis and Measurement,Beijing Normal University, Beijing 100875, China E-mail: kangxiuying@263.net)  
The relationship between the three sharp lines A, NN1 and NN3 in the luminescence spectra of GaP and the laser excitation intensity Iex is shown experimentally. Moreover, when the thermal emission of NA and NN1 levels due to the high excitation power is included in the luminescence dynamics equations, the relation between ratio of INN1/IA, Iex and the nitrogen concentration [N] of GaP is obtained. Then it is used for fitting the experimental data and the result is better. In the last, some advice is given about determining nitrogen concentration by this way.
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