Effect of excitation power density on the upconversion luminescence of LaF3:Yb3+, Er3+ nanocrystals

被引：22

作者：

Qu, Yuqiu ^{[1
,2
]}

Kong, Xianggui ^{[1
]}

Sun, Yajuan ^{[1
]}

Zeng, Qinghui ^{[1
]}

Zhang, Hong ^{[3
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Changchun 130033, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

[3] Univ Amsterdam, Vant Hoff Inst Mol Sci, Amsterdam, Netherlands

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 485卷 / 1-2期

关键词：

Nanostructured materials; Optical properties; Optical spectroscopy; IN-VIVO; LANTHANIDE; GREEN; NANOPHOSPHORS; NANOPARTICLES; FLUORESCENCE; PHOSPHORS; THERAPY; CELLS; IONS;

D O I：

10.1016/j.jallcom.2009.05.145

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 upconversion fluorescent Yb3+, Er3+ ions co-doped LaF3 nanocrystals were synthesized and studied. The nanocrystals display green and red visible emissions under 980 min near infrared excitation. which is suitable for biological application. The effect of excitation power density on the upconversion luminescence properties of nanocrystals are investigated detailed. Under lower pump power density irradiation. the upconversion luminescence shows a typical two photon involved process When the pump power density turns to higher region, the dependence of upconversion emission intensity versus the excitation power density exhibits as the hysteresis loops which does not accord with the normal two-photon process. This phenomenon may be caused by the thermal effect which can increase the temperature of nanocrystals, and then enhance the visible emissions greatly. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved

引用

页码：493 / 496

页数：4

共 28 条

[1] Upconversion and anti-stokes processes with f and d ions in solids [J].

Auzel, F .

CHEMICAL REVIEWS, 2004, 104 (01) :139-173

[2] Quantum dot bioconjugates for ultrasensitive nonisotopic detection [J].

Chan, WCW ;

Nie, SM .

SCIENCE, 1998, 281 (5385) :2016-2018

[3] Upconversion fluorescence imaging of cells and small animals using lanthanide doped nanocrystals [J].

Chatteriee, Dev K. ;

Rufalhah, Abdul J. ;

Zhang, Yong .

BIOMATERIALS, 2008, 29 (07) :937-943

[4] Imaging plant cells by two-photon excitation [J].

Feijó, JA ;

Moreno, N .

PROTOPLASMA, 2004, 223 (01) :1-32

[5] Near-infrared resonant nanoshells for combined optical imaging and photothermal cancer therapy [J].

Gobin, Andre M. ;

Lee, Min Ho ;

Halas, Naomi J. ;

James, William D. ;

Drezek, Rebekah A. ;

West, Jennifer L. .

NANO LETTERS, 2007, 7 (07) :1929-1934

[6] Energy transfer processes in Er3+-doped and Er3+,Pr3+-codoped ZBLAN glasses [J].

Golding, PS ;

Jackson, SD ;

King, TA ;

Pollnau, M .

PHYSICAL REVIEW B, 2000, 62 (02) :856-864

[7] Hexagonal sodium yttrium fluoride based green and blue emitting upconversion phosphors [J].

Krämer, KW ;

Biner, D ;

Frei, G ;

Güdel, HU ;

Hehlen, MP ;

Lüthi, SR .

CHEMISTRY OF MATERIALS, 2004, 16 (07) :1244-1251

[8] An efficient and user-friendly method for the synthesis of hexagonal-phase NaYF4: Yb, Er/Tm nanocrystals with controllable shape and upconversion fluorescence [J].

Li, Zhengquan ;

Zhang, Yong .

NANOTECHNOLOGY, 2008, 19 (34)

[9] In vivo and scanning electron microscopy imaging of upconverting nanophosphors in Caenorhabditis elegans [J].

Lim, SF ;

Riehn, R ;

Ryu, WS ;

Khanarian, N ;

Tung, CK ;

Tank, D ;

Austin, RH .

NANO LETTERS, 2006, 6 (02) :169-174

[10] Red, green, and blue upconversion luminescence of trivalent-rare-earth ion-doped Y2O3 nanocrystals [J].

Matsuura, D .

APPLIED PHYSICS LETTERS, 2002, 81 (24) :4526-4528

← 1 2 3 →