The luminescence properties of Er 3+-doped and Er 3+–Tm 3+-co-doped phosphate glasses for white light emitting diode

Abstract

Phosphate glasses and glass ceramics doped with Er 3+ and co-doped with Er 3+–Tm 3+ are presented in this work. The luminescence properties have been characterized by absorption, excitation and emission spectra. All samples excited by blue light could emit a combination of blue/green/orange/red wavelength giving white light. For Er 3+-doped glasses, a self-quenching effect has been obtained and an adjustable tune comes out after crystallization. For co-doped glasses, the red emission at 651 nm has been enhanced due to the existence of Tm 3+, which could be relative to both the overlapped emissions and the energy transfer from Tm 3+ to Er 3+.