Energy transfer from Eu2+ to Mn2+ in M5(PO4)3Cl (M = Ca, Sr)

被引：14

作者：

Yang, Fengli ^{[1
,2
,3
,4
]}

An, Wei ^{[5
]}

Zhuang, Weidong ^{[1
,2
]}

Tian, Guang-Shan ^{[5
]}

Jing, Xi-Ping ^{[3
]}

机构：

[1] Gen Res Inst Nonferrous Met, Natl Engn Res Ctr Rare Earth Mat, Beijing 100088, Peoples R China

[2] Grirem Adv Mat Co Ltd, Beijing 100088, Peoples R China

[3] Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat & Applicat, Beijing Natl Lab Mol Sci, Beijing 100871, Peoples R China

[4] Jiangxi Univ Sci & Technol, Sch Met & Chem Engn, Ganzhou 341000, Jiangxi, Peoples R China

[5] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

来源：

JOURNAL OF LUMINESCENCE | 2014年 / 146卷

基金：

国家高技术研究发展计划(863计划);

关键词：

Phosphors for LED; Energy transfer; Eu2+-Mn2+ co-doping; Chlorophosphates; EMISSION-TUNABLE PHOSPHOR; HIGH-BRIGHTNESS; MECHANISM;

D O I：

10.1016/j.jlumin.2013.10.003

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

M4.95-y(PO4)(3)Cl:0.05Eu(2+), yMn(2+) (m = Ca, Sr) phosphors were synthesized at 1200 degrees C under a reductive atmosphere. The energy transfer mechanism and efficiency (eta) from Eu2+ to Mn2+ as well as the quantum efficiency (Q) of the Mn2+ emission were analyzed using PL spectra and decay curves. Least squares fittings of the Eu2+ decay curves indicate that the energy transfer from Eu2+ to Mn2+ follows the exchange mechanism in the Sr system, while besides exchange mechanism other complicated quenching processes are involved in the Ca system. Superficially the eta is high but the Q is low, which implies some energy loss. Two quenching models representative of an "inverse bottleneck process", which is related to the lifetime mismatch between Eu2+ and Mn2+, and a "charge transfer process" in the Eu2+-Mn2+ clusters, are proposed. The results may provide some clues for designing excellent sensitizer and activator co-doped phosphors in our further work. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：269 / 274

页数：6

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