Color variation of ZnGa[sub 2]O[sub 4] phosphor by reduction-oxidation processes

Kim, J. S.; Kang, H. I.; Kim, W. N.; Kim, J. I.; Choi, J. C.; Park, H. L.; Kim, G. C.; Kim, T. W.; Hwang, Y. H.; Mho, S. I.; Jung, M.-C.; Han, M.
March 2003
Applied Physics Letters;3/31/2003, Vol. 82 Issue 13, p2029
Academic Journal
The color of the emission of zinc gallate (ZnGa[SUB2]O[SUB4]) oscillates between ultraviolet and blue by hydrogen ambient reduction and air ambient oxidation heat treatments. The photoluminescence spectra and electron paramagnetic resonance signals show that ultraviolet emission of reduced (ZnGa[SUB2]O[SUB4] always accompanies 680 nm emission originating from single oxygen vacancies (V[SUBO,SUP*]). The increasing difference in binding energy between Ga[SUP3+] and O[SUP2-] in reduced ZnGa[SUB2]O[SUB4] indicates)that the configuration of octahedral sites is distorted due to V[SUBO,SUP*] generation and it becomes more ionic which shifts the emission band from 430 to 360 nm. The x-ray diffraction patterns and Raman scattering spectra show that β-Ga[SUB2]O[SUB3] from ZnGa[SUB2]O[SUB4] is formed in both reduction and oxidation processes which suggests the vaporization of Zn ions. We propose a model in which the origin of 360 nm emission is the Ga-O transition at distorted octahedral sites with V[SUBO,SUP*] in ZnGa[SUB2]O[SUB4], whereas 430 nm emission originates from the Ga-O transition of regular octahedral sites without V[SUBO,SUP*] in ZnGa[SUB2]O[SUB4].


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