论文类型：期刊论文
第一作者：程曲
通讯作者：童浩
合写作者：缪向水,林琪
发表刊物：Journal of Alloys and Compounds
所属单位：华中科技大学
学科门类：工学
一级学科：电子科学与技术
文献类型：J
卷号：772
页面范围：905-911
关键字：Red phosphorα-phase La2W2O9High quantum efficiencyEuropium
DOI码：10.1016/j.jallcom.2018.08.320
发表时间：4348-12-01
摘要：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.
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0925838818332158?via%3Dihub#kwrds0010