Novel narrow-band blue light-emitting phosphor of Eu2+-activated silicate used for WLEDs

Abstract

Owing to the broad application scope of phosphors for light and display, the development of narrow-band light-emitting phosphors has recently gained considerable research attention. In this study, a new type of narrow-band blue light-emitting phosphor, Rb₂HfSi₃O₉:Eu²⁺, with a full width at half maximum (FWHM) of 64 nm was synthesized successfully. Upon the near visible ultraviolet (NUV) light excitation, the internal quantum efficiency of Rb₂HfSi₃O₉:Eu²⁺ was 68%. It also exhibited good thermal stability, which was higher than that of a commercial blue phosphor (BaMgAl₁₀O₁₇:Eu²⁺) at 150 °C. The significant photoluminescence properties of Rb₂HfSi₃O₉:Eu²⁺ were found to be related to its robust crystal structure, which was investigated in detail. The results indicate that Eu²⁺-activated Rb₂HfSi₃O₉ is a promising phosphor for use in white light-emitting diodes.