Temperature dependent photoluminescence of Dy3+ doped LiCaBO3 phosphor

Abstract

A single phase white light emitting Dy3+ doped LiCaBO3 phosphors were prepared by solid-state reaction method at 700 °C. The crystal structure properties were analyzed by utilizing powder X-ray Diffraction and followed by the profile fitting to calculate the lattice parameters. The FESEM, UV–Vis, photoluminescence excitation and emission spectra, decay time and quantum yield measurement were utilized to characterize the samples. The temperature dependent photoluminescence emission and decay times were recorded in the temperature range 100–480 K. The phosphor exhibits two emission bands at 485 nm (blue) and 578 nm (yellow) originating from the f–f transition of Dy3+. The optimized doping concentration for maximum emission intensity was 2 mol%. A near white emission was achieved with color co-ordinate (0.35, 0.39) and CCT value 4955 K. The material had excellent thermal and color stability. The absolute quantum yield is 0.25. So the near white emission, excellent thermal stability and suitable quantum yield of LiCaBO3: Dy3+ can be a promising candidate for near UV–LED pumped white light emitting diode.