Blue to red color-tunable Eu-doped AlPO4 mesoporous glass

Abstract

A tunable luminescence from red to blue in Eu-doped mesoporous AlPO4glass is achieved by adjusting the annealing temperature. With increasing annealing temperature, the increased Eu3+ions reduction changes the luminescence of the obtained glass. The abnormal reduction of Eu3+to Eu2+occurs in AlPO4mesoporous glass at relative low annealed temperatures from 600 to 800°C in air. The presence of Eu2+ions, which are reduced from Eu3+by hole-electron pairs, is revealed by XPS spectra. Our results indicate the mesoporous AlPO4glass is a suitable matrix to incorporate Eu ions as the tunable luminescent light sources or LEDs. © 2014 Chinese Optics Letters.