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Luminescence enhancement of (Sr 1– x M x ) 2 SiO 4 :Eu 2 + phosphors with M (Ca 2 + /Zn 2 + ) partial substitution for white light‐emitting diodes
Author(s) -
Wang Yulong,
Zhang Wentao,
Gao Yang,
Long Jianping,
Li Junfeng
Publication year - 2017
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3159
Subject(s) - phosphor , luminescence , analytical chemistry (journal) , ion , crystal structure , alkaline earth metal , doping , materials science , crystallography , chemistry , alkali metal , optoelectronics , organic chemistry , chromatography
Abstract Eu 2 + ‐doped Sr 2 SiO 4 phosphor with Ca 2 + /Zn 2 + substitution, (Sr 1– x M x ) 2 SiO 4 :Eu 2 + (M = Ca, Zn), was prepared using a high‐temperature solid‐state reaction method. The structure and luminescence properties of Ca 2 + /Zn 2 + partially substituted Sr 2 SiO 4 :Eu 2 + phosphors were investigated in detail. With Ca 2 + or Zn 2 + added to the silicate host, the crystal phase could be transformed between the α ‐form and the β ‐form of the Sr 2 SiO 4 structure. Under UV excitation at 367 nm, all samples exhibit a broad band emission from 420 to 680 nm due to the 4f 6 5d 1 → 4f 7 transition of Eu 2 + ions. The broad emission band consists of two peaks at 482 and 547 nm, which correspond to Eu 2 + ions occupying the ten‐fold oxygen‐coordinated Sr.(I) site and the nine‐fold oxygen‐coordinated Sr.(II) site, respectively. The luminescence properties, including the intensity and lifetime of Sr 2 SiO 4 :Eu 2 + phosphors, improved remarkably on Ca 2 + /Zn 2 + addition, and promote its application in white light‐emitting diodes. Copyright © 2016 John Wiley & Sons, Ltd.