Indexed by: Journal paper

First Author: 程曲

Correspondence Author: TONG HAO

Co-author: 缪向水,林琪

Journal: Journal of Alloys and Compounds

Affiliation of Author(s): 华中科技大学

Discipline: Engineering

First-Level Discipline: Electronic Science And Technology

Document Type: J

Volume: 772

Page Number: 905-911

Key Words: Red phosphorα-phase La2W2O9High quantum efficiencyEuropium

DOI number: 10.1016/j.jallcom.2018.08.320

Date of Publication: 4348-12-01

Abstract: High-quality inorganic red-emitting phosphors are widely used in white light-emitting diodes to realize excellent white light emission. Tungstate is one of the most popular materials for phosphors due to their great chemical stability and unique luminescent properties. However, the quantum efficiency of tungstate-based phosphor is still not high enough for commercial application. In this study, we synthesized a series of α-La2W2O9: Eu3+ phosphors by a modified high-temperature solid-state reaction method. The prepared phosphors crystallized well in triclinic structure. Eu3+ ion mainly substituted La3+ ion in La (1) site of low local symmetry as C1, thus the phosphors showed a strong red emission at 618 nm by 5D0→7F2 transition. When Eu3+ doping concentration is 3%, α-La2W2O9: 3%Eu3+ presents maximum luminescent intensity, longest lifetime (0.651 ms) and highest quantum yield (77%). Furthermore, the mechanism of concentration quenching is discussed and indicates that electric dipole-dipole interaction is the dominant mechanism. Our study demonstrates a high-quality red-emitting phosphor based on α-La2W2O9: 3%Eu3+, which is potential for commercial white light-emitting diodes applications.

Links to published journals: https://www.sciencedirect.com/science/article/pii/S0925838818332158?via%3Dihub#kwrds0010