Transient demonstration of exciton behaviours in solid state cathodoluminescence under different driving voltage |
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Authors: | Zhang Fu-Jun Zhao Su-Ling Xu Zheng Huang Jin-Zhao and Xu Xu-Rong |
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Institution: | Institute of Optoelectronic Technology, Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Beijing 100044, China; Institute of Physics, Humboldt University, Berlin 12489, Germany |
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Abstract: | In the solid state cathodoluminescence (SSCL), organic materials were
excited by hot electrons accelerated in silicon oxide (SiO2)
layer under alternating current (AC). In this paper exciton
behaviours were analysed by using transient spectra under different
driving voltages. The threshold voltages of SSCL and exciton
ionization were obtained from the transient spectra. The
recombination radiation occurred when the driving voltage went beyond
the threshold voltage of exciton ionization. From the transient
spectrum of two kinds of luminescence (exciton emission and
recombination radiation), it was demonstrated that recombination
radiation should benefit from the exciton ionization. |
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Keywords: | electroluminescence ionization |
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