Mechanism for energy transfer processes between Ce3+ and Tb3+ in LaPO4:Ce,Tb nanocrystals by time-resolved luminescence spectroscopy

被引：50

作者：

Pankratov, V. ^{[1
]}

Popov, A. I. ^{[1
,2
]}

Chernov, S. A. ^{[1
]}

Zharkouskaya, A. ^{[3
]}

Feldmann, C. ^{[3
]}

机构：

[1] Latvian State Univ, Inst Solid State Phys, LV-1063 Riga, Latvia

[2] Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France

[3] Karlsruhe Inst Technol, Inst Inorgan Chem, D-76131 Karlsruhe, Germany

来源：

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2010年 / 247卷 / 09期

关键词：

nanophosphors; rare earth phosphates; time-resolved luminescence spectroscopy; LIQUID-PHASE SYNTHESIS; LAPO4-CE; TB NANOCRYSTALS; QUANTUM DOTS; NANOPARTICLES; CRYSTALS; COLLOIDS; EXCITON;

D O I：

10.1002/pssb.200945369

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The energy transfer mechanisms between Ce3+ and Tb3+ in LaPO4:Ce, Tb nanocrystals have been studied by means of time-resolved luminescence spectroscopy in a wide temperature range (10-300 K). Special attention was paid to detailed comparative analysis of both rise and decay emission components of both Ce3+ and Tb3+. Surprisingly, a relatively slow rise (several microseconds) of Tb3+ emission under 266-nm laser excitation was detected, which corresponds to the 4f-5d transition of Ce3+ in LaPO4. It was shown that this rise of Tb3+ emission could not have arisen due to relaxation of Ce3+ ions, whose excited state has a lifetime of about 20 ns. It was demonstrated that the generally accepted concept of a resonant energy transfer from Ce3+ to Tb3+ in LaPO4 could not explain the time- resolved luminescence characteristics as well as the observed temperature dependence. Hence, a new concept of the energy transfer process from Ce3+ to Tb3+ in LaPO4 via host lattice states was suggested and elucidated by proposing several possible models. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：2252 / 2257

页数：6

共 38 条

[1]

ALLEN JW, 1989, SPRINGER P PHYSICS, V38, P10

[2]

Blasse G., 1994, LUMINESCENT MAT, P1, DOI [10.1007/978-3-642-79017-1_1, DOI 10.1007/978-3-642-79017-1_1, 10.1007/978-3-642-79017-11, DOI 10.1007/978-3-642-79017-11]

[3] QUANTUM EFFICIENCY OF DIFFUSION LIMITED ENERGY-TRANSFER IN LA1-X-YCEXTBYPO4 [J].

BOURCET, JC ;

FONG, FK .

JOURNAL OF CHEMICAL PHYSICS, 1974, 60 (01) :34-39

[4] Transparent luminescent layers via ionic liquid-based approach to LaPO4:RE (RE = Ce, Tb, Eu) dispersions [J].

Buehler, G. ;

Feldmann, C. .

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2007, 87 (04) :631-636

[5] Microwave-assisted synthesis of luminescent LaPO4:Ce,Tb nanocrystals in ionic liquids [J].

Buehler, Gunnar ;

Feldmann, Claus .

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2006, 45 (29) :4864-4867

[6] Photo- and thermo-stimulated luminescence of CsI-Tl crystal after UV light irradiation at 80 K [J].

Chernov, SA ;

Trinkler, L ;

Popov, AI .

RADIATION EFFECTS AND DEFECTS IN SOLIDS-INCORPORATING PLASMA SCIENCE AND PLASMA TECHNOLOGY, 1998, 143 (04) :345-355

[7] Absolute location of lanthanide energy levels and the performance of phosphors [J].

Dorenbos, Pieter .

JOURNAL OF LUMINESCENCE, 2007, 122 (315-317) :315-317

[8] Radiative versus nonradiative decay processes in silicon nanocrystals probed by time-resolved photoluminescence spectroscopy [J].

Dovrat, M ;

Goshen, Y ;

Jedrzejewski, J ;

Balberg, I ;

Sa'ar, A .

PHYSICAL REVIEW B, 2004, 69 (15) :155311-1

[9] In vivo imaging of quantum dots encapsulated in phospholipid micelles [J].

Dubertret, B ;

Skourides, P ;

Norris, DJ ;

Noireaux, V ;

Brivanlou, AH ;

Libchaber, A .

SCIENCE, 2002, 298 (5599) :1759-1762

[10] Inorganic luminescent materials:: 100 years of research and application [J].

Feldmann, C ;

Jüstel, T ;

Ronda, CR ;

Schmidt, PJ .

ADVANCED FUNCTIONAL MATERIALS, 2003, 13 (07) :511-516

← 1 2 3 4 →