Synthesis, characterization and photoluminescence properties of Tm3+-doped Ca2YTaO6 blue-emitting phosphors

Jianhua Li,Bin Deng,Jing Liao,Jinyu Huang,Jinjin Fu

doi:10.1051/e3sconf/202126702018

Abstract

A series of Ca2YTaO6: Tm3+ blue-emitting phosphors were firstly prepared by the solid-state method. The phase formations and purity of Ca2YTaO6: xTm3+ (x = 0.3%-5% mol) were verified by X-ray powder diffraction. The morphological characteristics of Ca2YTaO6: 0.005Tm3+ were detected by scanning electron microscopy (SEM). Photoluminescence properties were discussed by emission (λem = 460 nm) and excitation (λex = 359 nm) spectra. The critical doping concentration of the products was 0.005 mol. The proposed concentration quenching mechanism in Ca2YTaO6 materials was the electric multipole interaction. Besides, the color coordinates (0.1408, 0.0891) of Ca2YTaO6: 0.005Tm3+ were located in blue region. The results suggested the Ca2YTaO6: Tm3+ phosphors can be promising blue-emitting components for the WLED applications.

Highlights

Attaching great importance of energy-saving and environment protection, the traditional fluorescent lamps and incandescent lamps in daily lighting were fade away
The surface morphology and particle sizes of phosphors are important for White light-emitting diodes (WLEDs) applications
The energy transfer mechanism in the Ca2YTaO6: Tm3+ system is discussed in terms of critical energy transfer distance (Rc), which can be estimated by the equation (1) [24,25,26,27,28]: Rc

Summary

Introduction

Attaching great importance of energy-saving and environment protection, the traditional fluorescent lamps and incandescent lamps in daily lighting were fade away. White light-emitting diodes (WLEDs) are getting growing attention for the merits of energy-saving, improving efficiency, etc.[1,2,3,4,5,6,7]. (1) Combining the blue LED chips with Ce3+ doped Y3Al5O12 phosphors. The quest for blue-emitting phosphors for lighting is an important and urgent challenge for investigators. Eu3+, Sm3+, Dy3+, and Mn4+ doped Ca2YTaO6 phosphors were proved to be well applied in the WLED applications [14, 15]. Many published works reported Tm3+ doped phosphors for the WLED applications, such as Y2Mg2Al2Si2O12: Eu2+, Ce3+, NaY9Si6O26: Ce3+, Eu3+, NaSrPO4: Tm3+, and Li3Gd3Te2O12: Tm3+ [16,17,18,19]. The morphology, the concentration quenching mechanism, photoluminescence (PL) properties, and CIE color coordinates were investigated in detail

Synthesis method

Characterization method

Results and discussion

Conclusions