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Luminescent Properties of YNbO[sub 4]:Bi Phosphors
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2000
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Optical MaterialsEngineeringPhotoluminescencePhotochemistryYttrium NiobateOptical PropertiesLuminescent GlassOptoelectronic MaterialsApplied PhysicsLuminescence BehaviorOptoelectronic DevicesChemistryLuminescence PropertyOptoelectronicsBi ContentPhosphorescenceBi Phosphors
Yttrium niobate doped with Bi was prepared using a solid‐state reaction technique and its luminescence behavior was investigated under ultraviolet and low‐voltage electron excitations and with the first‐principle calculations. The optimization of the photo‐and cathodoluminescent properties was studied with control of Bi amounts and Y/Nb ratios. It was found that the luminance of :phosphors depends on the calcining conditions, Bi content, and particularly on the Y/Nb ratio. 0.2 wt % phosphors with a Y/Nb ratio of 52/48 showed the maximum emission intensity. The luminescent properties of and phosphors were interpreted with the calculated density of states (DOS) using density functional theory. From the calculated DOS, we were able to explain the charge transfer gap in the host and the effect of Bi in the excitation and emission spectra. © 2000 The Electrochemical Society. All rights reserved.