Synthesis and luminescence properties of novel red-emitting Na2ZnSiO4:Eu3+ phosphor with intense 5D0 → 7F4 transition and high quantum yield

JOURNAL OF ALLOYS AND COMPOUNDS

卷:787

Article

Liu, Chuanjie¹  Zhou, Zhufa¹  Zhang, Ying¹ 

[1] Soochow Univ, Coll Chem Chem Engn & Mat Sci, Suzhou 215123, Peoples R China

关键词: Na2ZnSiO4:Eu3+;    Red phosphor;    Crystal structure;    Luminescence properties;   

DOI  :  10.1016/j.jallcom.2019.02.140

来源: Elsevier

【 摘 要 】

Novel red-emitting Eu3+-doped Na2ZnSiO4 phosphors were synthesized by a conventional high temperature solid reaction. The crystal structure was confirmed by X-ray diffraction (XRD) and the morphology was examined by scanning electron microscopy (SEM). The luminescence properties of Na2-xZn1-xSiO4:xEu(3+) (NZS:xEu) phosphors were investigated by photoluminescence excitation (PLE), emission (PL) spectra and decay curves. The phosphors exhibit abnormal intense red emission which located at 702 nm due to the D-5(0) -> F-7(4) transition of Eu3+ under the excitation of 393 nm and it makes the CIE chromaticity coordinates of the phosphors to fall in a red region. This phenomenon may be explained by the highly polarizable chemical circumstance. The optimum Eu3+ doping concentration of NZS:xEu is determined to be x = 0.08. The critical distance between Eu3+ was calculated to be 13.36 angstrom. The concentration quenching mechanism can be interpreted by the quadrupole-quadrupole interaction of Eu3+ ions. The decay curves show double exponential behavior for all concentrations of Eu3+ ions and the lifetimes varied from 0.67 to 1.3 ms when the Eu3+ doping concentration increased in the range of 4-12 mol%. The quantum yield (QY) of Na2ZnSiO4:0.08Eu(3+) phosphor is calculated to be as high as 88.76%. The present work suggests that Na2ZnSiO4:Eu3+ phosphor is a promising candidate as a red component for NUV LEDs application. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

Free