Alkali metal coactivators in SrS: Cu,F thin-film electroluminescent devices Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/3n204066d

Article appears in Applied Physics Letters ( http://apl.aip.org/) and is copyrighted by American Institute of Physics ( http://www.aip.org/).

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  • A unique approach for obtaining bright and efficient saturated green phosphors for alternating-current thin-film electroluminescent (ACTFEL) device applications is presented. The approach involves color-shifting blue SrS:Cu,F ACTFEL phosphors into the green region of the spectrum via the incorporation of alkali metal ions into the SrS lattice. Alkali metals are incorporated into SrS:Cu,F phosphors by using LiF, NaF, KF, RbF, or CsF coactivators. The best result to date is obtained by using a KF coactivator and results in a saturated green brightness and efficiency of 52.7 cd/m² and 0.973 lm/W (at a frequency of 60 Hz and an overvoltage of 40 V). In addition to providing a color shift, the alkali-metal fluorides improve the overall performance of the ACTFEL device by increasing the magnitude of the electric field and its uniformity across the phosphor through suppression of positive space charge.
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  • Keir, P. D., Wager, J. F., Clark, B. L., Li, D., & Keszler, D. A. (1999). Alkali metal coactivators in SrS: Cu,F thin-film electroluminescent devices. Applied Physics Letters, 75(10), 1398-1400.
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