Superhigh-luminance amorphous red phosphors for laser illumination and information recognition

Abstract

Monochromatic superhigh brightness fluorescence is achieved in Eu3+ doped amorphous multicomponent borotellurite (MBT-Eu) photoluminescence phosphors with excellent chemical stability and long service life by contrast with traditional red phosphors. The 6.0 wt% Eu2O3-doped phosphors (MBT-Eu6) exhibit not only a superior quantum efficiency of 96.2%, but also a high quantum yield up to 26.8% under 401 nm LED excitation, confirming the MBT glass host supplies an outstanding medium for the effective performance of Eu3+. The luminescence of MBT-Eu6 is elevated to a higher level with the luminous flux of 47.42 lm using a 465 nm blue laser at 805.7 mW incident laser power, and red fluorescence of MBT-Eu6 still remain a certain intensity even if temperature rises to 533 K indicating the excellent thermal stability of MBT-Eu6. By further combined with screen printing technology to produce fluorescent information codes, message recognition using remote excitation is achieved in the dark environment. The present study provides detailed insights into the realization of superhigh brightness phosphors and new inspirations in developing optical information recognition and red monochromatic lighting.