Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals

被引：41

作者：

Chen, Junsheng ^{[1
,2
,3
]}

Chabera, Pavel ^{[1
,2
]}

Pascher, Torbjorn ^{[1
,2
]}

Messing, Maria E. ^{[4
,5
]}

Schaller, Richard ^{[6
,7
]}

Canton, Sophie ^{[8
,9
]}

Zheng, Kaibo ^{[1
,2
,10
]}

Pullerits, Tonu ^{[1
,2
]}

机构：

[1] Lund Univ, Dept Chem Phys, POB 124, S-22100 Lund, Sweden

[2] Lund Univ, NanoLund, POB 124, S-22100 Lund, Sweden

[3] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

[4] Lund Univ, Solid State Phys, Box 118, S-22100 Lund, Sweden

[5] Lund Univ, NanoLund, Box 118, S-22100 Lund, Sweden

[6] Argonne Natl Lab, Ctr Nanoscale Mat, 9700 Cass Ave, Argonne, IL 60439 USA

[7] Northwestern Univ, Dept Chem, 2145 Sheridan Rd, Evanston, IL 60208 USA

[8] ELI HU Nonprofit Ltd, ELI ALPS, Dugon Ter 13, H-6720 Szeged, Hungary

[9] Deutsch Elektronen Synchrotron DESY, Attosci Grp, Notkestr 85, D-22607 Hamburg, Germany

[10] Qatar Univ, Coll Engn, Gas Proc Ctr, POB 2713, Doha, Qatar

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2017年 / 8卷 / 20期

基金：

瑞典研究理事会;

关键词：

SHELL QUANTUM DOTS; ABSORPTION CROSS-SECTION; OPTICAL-DATA STORAGE; STIMULATED-EMISSION; FLUORESCENT-PROBE; LIVE CELLS; PHOTOLUMINESCENCE; PHOTOSTABILITY; EVOLUTION; SHIFT;

D O I：

10.1021/acs.jpclett.7b02178

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：

Cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With two-photon excitation, red-shifted PL spectrum and increased PL lifetime is observed compared with one-photon excitation. We have investigated the origin of such difference using time resolved laser spectroscopies. We ascribe the difference to the enhanced size selection of NCs by two-photon excitation. Because of inherent nonlinearity, the size dependence of absorption cross-section under TPA is stronger. Consequently, larger size NCs are preferably excited, leading to longer excited-state lifetime and red-shifted PL emission. In a broad view, the enhanced size selection in two-photon excitation of CsPbBr3 NCs is likely a general feature of the perovskite NCs and can be tuned via NC size distribution to influence their performance within NC-based nonlinear optical materials and devices.

引用

页码：5119 / 5124

页数：6

共 38 条

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