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Study of dynamic space charge in SrS:Ce thin-film electroluminescent devices by tunable laser excitation

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6 Author(s)
Peter, Manuela ; Department of Electrical and Electronic Engineering, Tottori University, Koyama, Tottori 680, Japan ; Kashio, Yukinori ; Nishimura, Satoru ; Ohmi, Koutoku
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The origin of the dynamic space charge in SrS:Ce ac-driven thin-film electroluminescent devices is studied using photoinduced current measurements. Field assisted photoionization of Ce3+ centers and of intrinsic electron traps is observed. The results show that about 50% of the dynamic space charge in SrS:Ce originates from cerium ionization. The remaining 50% results from the ionization of crystal imperfections. © 1997 American Institute of Physics.

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Applied Physics Letters  (Volume:71 ,  Issue: 13 )