Tunable blue-green color emission and energy transfer properties of Li2CaGeO4:Ce3+, Tb3+ phosphors for near-UV white-light LEDs

被引：30

作者：

Jin, Yahong ^{[1
]}

Hu, Yihua ^{[1
]}

机构：

[1] Guangdong Univ Technol, Sch Phys & Optoelect Engn, Guangzhou 510006, Guangdong, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 610卷

基金：

中国国家自然科学基金;

关键词：

Optical materials; Inorganic materials; Solid state reactions; Optical properties; Energy transfer; LUMINESCENT PROPERTIES; SINGLE-PHASE; CE3+ IONS; EU2+; PHOTOLUMINESCENCE;

D O I：

10.1016/j.jallcom.2014.05.095

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The phosphors Li2CaGeO4:Ce3+, Tb3+ were synthesized via the conventional high temperature solid state reaction method. The fluorescence and lifetime properties reveal that the energy transfer from Ce3+ to Tb3+ ions takes place in the Li2CaGeO4 host. The emission color of obtained samples can be varied from blue to green through energy transfer by simply tuning the Ce3+/Tb3+ ratio. The energy transfer mechanism was illustrated in detail. Based on concentration quenching method, the critical distance of the energy transfer was calculated to be about 14.05 angstrom. The mechanism of energy transfer from Ce3+ to Tb3+ ions is a resonant type that occurs via dipole-quadrupole interaction. Green emission from Tb3+ can be obtained upon the excitation into Ce3+ ions (UV excitation), which indicates that Li2CaGeO4:Ce3+, Tb3+ may be a potential candidate of green emitting UV light convertible phosphor for w-LEDs. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：695 / 700

页数：6

共 42 条

[1] Luminescence properties of Eu2+ and Ce3+ ions in calcium lithio-germanate Li2CaGeO4 [J].

Berezovskaya, I. V. ;

Efryushina, N. P. ;

Seifullina, I. I. ;

Martsinko, E. E. ;

Zadneprovski, B. I. ;

Stryganyuk, G. B. ;

Voloshinovskii, A. S. ;

Levshov, S. M. ;

Dotsenko, V. P. .

CERAMICS INTERNATIONAL, 2013, 39 (06) :6835-6840

[2]

BLASSE G, 1969, PHILIPS RES REP, V24, P131

[3] ENERGY-TRANSFER BETWEEN INEQUIVALENT EU-2+ IONS [J].

BLASSE, G .

JOURNAL OF SOLID STATE CHEMISTRY, 1986, 62 (02) :207-211

[4] Material Properties and Structural Characterization of M3Si6O12N2:Eu2+ (M = Ba, Sr)-A Comprehensive Study on a Promising Green Phosphor for pc-LEDs [J].

Braun, Cordula ;

Seibald, Markus ;

Boerger, Saskia L. ;

Oeckler, Oliver ;

Boyko, Teak D. ;

Moewes, Alexander ;

Miehe, Gerhard ;

Tuecks, Andreas ;

Schnick, Wolfgang .

CHEMISTRY-A EUROPEAN JOURNAL, 2010, 16 (31) :9646-9657

[5] An intense green emitting LiSrPO4:Eu2+, Tb3+ for phosphor-converted LED [J].

Chen, Yan ;

Wang, Jing ;

Zhang, Xinguo ;

Zhang, Gongguo ;

Gong, Menglian ;

Su, Qiang .

SENSORS AND ACTUATORS B-CHEMICAL, 2010, 148 (01) :259-263

[6] Structure and white luminescence of Eu-activated (Ba,Sr)13-XAl22-2xSi10+2xO66 materials [J].

Denis, Gregoire ;

Deniard, Philippe ;

Gautron, Eric ;

Clabau, Frederic ;

Garcia, Alain ;

Jobic, Stephane .

INORGANIC CHEMISTRY, 2008, 47 (10) :4226-4235

[7] A THEORY OF SENSITIZED LUMINESCENCE IN SOLIDS [J].

DEXTER, DL .

JOURNAL OF CHEMICAL PHYSICS, 1953, 21 (05) :836-850

[8] The 4fn⇆4fn-15d transitions of the trivalent lanthanides in halogenides and chalcogenides [J].

Dorenbos, P .

JOURNAL OF LUMINESCENCE, 2000, 91 (1-2) :91-106

[9] Luminescent properties of Eu2+ and Ce3+ ions in strontium litho-silicate Li2SrSiO4 [J].

Dotsenko, V. P. ;

Levshov, S. M. ;

Berezovskaya, I. V. ;

Stryganyuk, G. B. ;

Voloshinovskii, A. S. ;

Efryushina, N. P. .

JOURNAL OF LUMINESCENCE, 2011, 131 (02) :310-315

[10]

Gard J. A., 1973, Journal of Solid State Chemistry, V7, P422, DOI 10.1016/0022-4596(73)90171-0

← 1 2 3 4 5 →