Luminescence and tunable color properties of uniphase white-emitting Sr3B2SiO8:Tm3+/Dy3+/Eu3+phosphors by energy transfer for UV-excited white LEDs

Bo Yuan,Yanhua Song,Guoyan Luan,Haifeng Zou,Chaochao Qi,Xiangting Zhang

doi:10.1007/s11082-021-03110-8

Abstract

Multi-color single-phase white emission Sr3B2SiO8:Tm3+/Dy3+/Eu3+ fluorescent powders were prepared by solid-state fritting method. The fluorescence performance of Tm3+, Dy3+ and Eu3+ ions single-activated Sr3B2SiO8 phosphors were investigated and they exhibit desirable behaviors in their characteristic emissions. Meanwhile, the energy required for migration from Tm3+ to Dy3+ and from Dy3+ to Eu3+ in co-doped fluorescent substance was determined by the aids of steady-state and transient-state photoluminescence spectra/decay measurements. The energy transmission process from Tm3+ to Dy3+and Dy3+ to Eu3+ has been explored to be a dipole–quadrupole interaction and a dipole–dipole interaction of the resonant type, respectively. More significantly, by tuning the molarity ratio of doping Dy3+/Eu3+ ions, multicolor emission from yellow to red shall be achieved in Sr3B2SiO8:Dy3+, Eu3+ phosphors for its potential adhibitions in solid-state lighting applications. The Sr3B2SiO8:Tm3+, Dy3+ samples can implement white light emission by the appropriate changeable doping molar quantity of Tm3+and Dy3+, applying potentially in white LEDs. The energy migrations between co-doped rare earth ions play a decisive role in these processes.

Highlights

Considered as the significant emerging lighting source, white light emitting diodes (WLEDs) are infiltrating the global optics space with a high speed of development due to their unique features of high luminous yield, long service life and small space usage (Chen et al 2014; Bharat 2016; Shang et al 2014; Liu et al 2018)
The absence of secondary phases confirm that the doping level of Tm3+, Dy3+ and Eu3+ ions is within the solubility limit and the small introduction is stabilized in the crystal structure of the matrix without inducing significant effect
A sort of original emission-tunable single-component SBSO:Tm3+/Dy3+/Eu3+ phosphor is prepared by high temperature solid state route and their luminescence characteristics were minutely studied

Summary

Introduction

Considered as the significant emerging lighting source, white light emitting diodes (WLEDs) are infiltrating the global optics space with a high speed of development due to their unique features of high luminous yield, long service life and small space usage (Chen et al 2014; Bharat 2016; Shang et al 2014; Liu et al 2018). It is a pity that the serious energy reabsorption and proportion imbalance occurs in the mixing of multi-component phosphors, which have a certain impact on the luminous efficiency and color reductivity (Liu et al 2014; Luwang 2011; Zhu et al 2007). Under this circumstance, another effective alternate was major concentrated in the single-phase phosphor with white or multi-color emission, which was more stimulated in the ultraviolet region. Seeking for novel single-phase phosphors and high efficient energy transfer has become greatly in demand

Methods

Results

Conclusion