A novel high efficiency emission-tunable solid solution luminescent material with non-concentration-quenching and excellent thermal stability

Abstract

A series of high efficiency Sr_1−xEu_xAl₂Si₃O₄N₄ (0.01 ⩽ x ⩽ 1) solid solution phosphors with non-concentration-quenching and excellent thermal stability were successfully designed and prepared. All samples have the A21am space group. Under near-ultraviolet (n-UV) light excitation, the emission peak of the samples can be tuned from 467 nm to 523 nm. The emission intensity of Sr_0.99Eu_0.01Al₂Si₃O₄N₄ and EuAl₂Si₃O₄N₄ at 150 °C is 97.5% and 84% at 25 °C, respectively, which are better than that of the commercial blue phosphor BaMgAl₁₀O₁₇(BAM):Eu²⁺ and green commercial phosphor (Sr, Ba)₂Si O₄:Eu²⁺. Sr_0.99Eu_0.01Al₂Si₃O₄N₄ exhibits zero-thermal quenching when the temperature is higher than 175 °C. The main reason for the zero-thermal quenching performance is the heat release compensation of electrons at high temperature. Using this series of phosphors as the blue and green components of WLEDs, the device color rendering index (CRI) is 93.5 and 89.7. The related color temperature (CCT) is 4854 K and 4153 K, respectively. The excellent data demonstrate that this series of phosphors has application potential in pc-WLEDs. In addition, the phosphor has good cathodoluminescence (CL) performance, and the intensity is not quenched under continuous electron beam bombardment.