Affiliation:
1. College of Materials Science and Engineering, Nanjing University of Technology, Jiangsu, Nanjing 210009, China
Abstract
Sr2TiO4:Eu3+phosphors using M+(M = Li+, Na+, and K+) as charge compensators were prepared by the solid-state reaction. The powders were investigated by powder X-ray diffraction (XRD) and photoluminescence spectra (PL) to study the phase composition, structure, and luminescent properties. The results showed that Li+ion was the best charge compensator. The phase was Sr2TiO4when the doping concentration was small (x≤10.0%). Whenxreached 15.0%, the phase turned into Sr3Ti3O7because of the structure damage. The phosphor could be effectively excited by ultraviolet (365, 395 nm) and blue light (465 nm), and thenitemitted intense red light that peaked at around 620 nm (5D0→7F2). In addition, the emission of 700 nm (5D0→7F4) enhanced the red light color purity. The CIE chromaticity coordinates of samples with the higher red emission were between (0.650, 0.344) and (0.635, 0.352). Doped layered titanate Sr2TiO4:Eu3+is a promising candidate red phosphor for white LEDs which can be suited for both near-UV LED chip and blue LED chip.
Funder
National Natural Science Foundation of China
Subject
General Materials Science
Cited by
20 articles.
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