Superior Thermally-Stable Narrow-Band Green Emitter From Mn2+-Doped Zero Thermal Expansion (Zte) Material

Thermal quenching is still a pivotal challenge for phosphor materials in white light emitting diodes lighting applications. Herein, we propose an effective strategy to design a near zero-thermal-quenching green emission in zero-thermal-expanding Zn4B6O13 host based on unique 3D isotropic cage structure. The integrated emission intensity of Zn4B6O13:Mn2+ could maintain 103% of initial intensity at 150 degrees C and 98% at 250 degrees C under blue light excitation. During the low-frequency vibrations, the unchanged bonds and angles induce the zero thermal expansion, and the unaffected lattice and coordination environment contribute the nearly unchanged emission intensity during the heating process. In addition, an efficient self-reduction of activators in the studied system is ascribed to vacancy and interstitial oxygen defects act as donors to provide electrons. This work initiates a novel strategy to construct thermally-stable and self-reductive phosphors for multiple optical applications.