Luminescent properties of Eu3+-doped glass ceramics containing BaCl2 nanocrystals under NUV excitation for White LED

Abstract

Eu3+ doped fluorozirconate glass ceramics containing BaCl2 nanocrystals were successfully fabricated by melt quenching method, and their structural and luminous properties were investigated. The existence of BaCl2 nanocrystals in the glass ceramics plays an important role on the improvement of luminescent properties. The emission intensity in glass ceramics was remarkably enhanced, which attributes to the phonon energy decrease by Eu3+ ions into BaCl2 nanocrystals. Meanwhile, the extended average fluorescence decay lifetime from 4.60ms to 5.42ms and the decreased Red/Orange ratio and spark splitting of 7F1 energy level also confirmed this view. Additionally, the excitation spectra showed that glass ceramics could be effectively excited by NUV light. The CIE chromaticity coordinates of glass ceramics (GC320) were calculated as (0.611, 0.371), which was close to the NTSC standard values for red (0.67, 0.33). The results suggested that the glass ceramics may be used as potential red phosphors under UV light excitation for white light-emitting diodes.