화학공학소재연구정보센터
Materials Research Bulletin, Vol.73, 38-47, 2016
A novel single-phase white phosphor NaBaBO3:Dy3+,K+ for near-UV white light-emitting diodes
A novel Dy3+-doped NaBaBO3 white-emitting phosphor has been prepared by high temperature solid-state reaction method. The phase structure and luminescence properties of NaBaBO3:Dy3+,K+ samples were investigated. Photoluminescence results show that the as-prepared samples could be effectively excited by near-ultraviolet (NUN) light and generate white light emission due to the E-4(912) -> H-6(15/2) (blue) transition and E-4(912) -> H-6(13/2) (yellow) transition of Dy3+ ions, respectively. The optimum doping concentration of Dy3+ ions in the NaBaBO3 host was determined to be 5.0 mol% and the CIE chromaticity of the sample was determined to be (0301, 0308). Moreover, the mechanism of ion as a charge compensator on the improvement of photoluminescence property and the effect of temperature on the photoluminescence property of NaBaBO3:Dy3+,K+ were investigated. Furthermore, photoluminescence decay and quantum efficiency behaviors of NaBaBO3:Dy3+,K+ were also studied. The present work demonstrates that the NaBaBO3:Dy3+,K+ phosphor is a potential candidate for NUV white light emitting diodes. (C) 2015 Elsevier Ltd. All rights reserved.