Synthesis and photoluminescence characteristics of (Sr, Ca) 3B2O6:Eu for application in white light-emitting diodes

摘要

A series of yellowgreen (Sr, Ca)3B2O6:Eu phosphors have been synthesized using precursors prepared via a facile solgel route. The solid-solution phases crystallized to materials with the formula of Sr3-x-yCaxEuyB2O6 with varied Ca2 and Eu2 contents. The emission peak centered at 540 nm under near-UV excitation exhibited a broad-band distribution in the range of 450650 nm. The dependences of the luminescence intensity on the contents of Ca2 substitution and Eu2 dopant were also investigated. The composition in the host lattice sensitively affected the chromaticity index. Sr1.21Ca1.7Eu0.09B 2O6 (SCB:0.09Eu) was shown to possess the highest intensity and broadest emission band. Calcining temperature was shown to greatly influence the luminescent properties of SCB:0.09Eu. It is concluded that SCB:0.09Eu can be used as an efficient yellowgreen phosphor for white light-emitting diodes (white LEDs) applications.