Size and Concentration Effects on the Photoluminescence of La2O2S:Eu3+ Nanocrystals

被引：124

作者：

Dai, Qilin ^{[2
,3
]}

Song, Hongwei ^{[1
]}

Wang, Meiyuan ^{[2
,3
]}

Bai, Xue ^{[1
]}

Dong, Biao ^{[1
]}

Qin, Ruifei ^{[2
,3
]}

Qu, Xuesong ^{[2
,3
]}

Zhang, Hui ^{[2
,3
]}

机构：

[1] Jilin Univ, Coll Elect Sci & Engn, State Key Lab Integral Optoelect, Changchun 130012, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Changchun 130033, Peoples R China

[3] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, Key Lab Excited State Phys, Changchun 130033, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2008年 / 112卷 / 49期

关键词：

D O I：

10.1021/jp808343f

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 effects of size and europium concentration on photoluminescence properties of La2O2S: Eu3+ nanocrystals (similar to 20 nm) and the corresponding bulk were studied. The results indicate that in nanocrystals, the absorption edge largely shifted to blue in comparison to the bulk, which was mainly attributed to the variation of phonon-excitation relaxation. Two excitation bands were observed, located at similar to 250 and similar to 330 nm, respectively, corresponding to the charge transfer (CT) transitions of Eu-O and Eu-S. Relative to the CT transition of Eu-O, that of Eu-S increased greatly with europium concentration. The dependence of photoluminescence intensity on concentration showed that in the nanocrystals and the bulk, Eu3+ ions had two different quenching mechanisms, respectively, the exchange interaction and electric dipole-dipole interaction.

引用

页码：19399 / 19404

页数：6

共 40 条

[1] A new synthetic method to prepare spherical phosphors for emissive screen applications [J].