Transferred charge analysis of evaporated ZnS:Mn alternating-current thin-film electroluminescent devices
作者:
R. Myers,
J. F. Wager,
期刊:
Journal of Applied Physics
(AIP Available online 1997)
卷期:
Volume 81,
issue 1
页码: 506-510
ISSN:0021-8979
年代: 1997
DOI:10.1063/1.364127
出版商: AIP
数据来源: AIP
摘要:
Evaporated ZnS:Mn alternating-current thin-film electroluminescent (ACTFEL) devices are assessed via frequency- and temperature-dependent transferred charge analysis. The frequency-dependent trends involve the threshold voltage and the slope of the transferred charge immediately above threshold, both of which increase with increasing frequency. At ∼15–20 V above threshold, the slope of the transferred charge curve is relatively independent of frequency and is approximately equal to the physical insulator capacitance. The temperature‐dependent trends indicate that the phosphor capacitance increases and the slope of the transferred charge immediately above threshold decreases with increasing temperature. These frequency‐ and temperature‐dependent trends are interpreted as arising from metastable hole trapping in which holes created in the phosphor by band‐to‐band impact ionization remain trapped in metastable traps at the cathode interface instead of being annihilated by electrons trapped at interface states. ©1997 American Institute of Physics.
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