Electroluminescence of ZnS Phosphors Excited by Short Field Pulses

概要

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The electroluminescence in ZnS:Cu, Pb phosphors excited by short field pulses are investigated and excitation and recombination mechanisms of luminescent centers are discussed. The exciting pulse fields used in these experiments are rectangular pulses having durations of 1 to 40 microseconds. From the experimental results about emission spectra, brightness waveforms, dependences of light outputs on the applied voltages and pulse durations, decay times, build-up characteristics and their temperature dependences, the following considerations are made: the local intense field generated at the cathode region of phosphor particle accerelates the primary electrons and the luminescent centers are impact-ionized by these electrons. The field strength may be smaller than in the case of sinusoidal field excitation and then the excitation efficiency of primary electron greatly decreases compared with the latter case. The primary electrons are partly generated thermally and partly by the direct field-ionization. The decay of electroluminescence obeys the bimolecular law and is affected by the electron traps in the region of long pulse durations. The build-up characteristics are also affected by the deeply lying electron traps.
社団法人日本物理学会の論文
1959-09-05