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Current crowding and phosphor efficacy in ac thin‐film electroluminescent display devices
Author(s) -
Singh Vijay P.,
Bhaskaran Suraj,
McClure John C.
Publication year - 1996
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1984991
Subject(s) - phosphor , luminance , electroluminescence , materials science , electroluminescent display , optoelectronics , manganese , thin film , electron , current (fluid) , limiting , layer (electronics) , optics , electrical engineering , physics , nanotechnology , mechanical engineering , engineering , quantum mechanics , metallurgy
— The variation of luminance with transferred charge in ZnS:Mn ac thin‐film electroluminescent (ACTFEL) display devices was analyzed to determine the roles played by the preferred current paths (filamentary conduction) and manganese clustering in limiting the phosphor efficiency. Luminance‐charge ( L‐Q ) characteristics were measured in ZnS:Mn ACTFEL devices of varying Mn concentrations. L‐Q characteristics showed a reduction in slope at higher values of Q . Also, the value of Q where the slope changed varied with the Mn/Zn ratio. These effects were attributed to the existence of preferred current paths in the phosphor layer where hot‐electron flow clustered.