Light emission and amplification in charged CdSe quantum dots

被引：122

作者：

Wang, CJ

Wehrenberg, BL

Woo, CY

Guyot-Sionnest, P ^{[1
]}

机构：

[1] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA

[2] SUNY Stony Brook, Dept Phys & Astron, Stony Brook, NY 11794 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2004年 / 108卷 / 26期

关键词：

D O I：

10.1021/jp0489830

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：

Photoluminescence from charged colloidal CdSe quantum dots, with definite and controllable electron occupation, is observed. As charged nanocrystals still emit light but are transparent at the emission wavelength, the threshold for amplified stimulated emission is strongly reduced. We demonstrate 65% threshold reduction in charged CdSe nanocrystal films, and further reduction should be feasible. This opens new possibilities for achieving efficient lasing in these molecular-like systems.

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页码：9027 / 9031

页数：5

相关论文

共 30 条

[1] Multiexcitons confined within a subexcitonic volume: Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals [J].

Achermann, M ;

Hollingsworth, JA ;

Klimov, VI .

PHYSICAL REVIEW B, 2003, 68 (24)

[2] PHOTOLUMINESCENCE OF SINGLE SEMICONDUCTOR NANOCRYSTALLITES BY 2-PHOTON EXCITATION MICROSCOPY [J].

BLANTON, SA ;

DEHESTANI, A ;

LIN, PC ;

GUYOTSIONNEST, P .

CHEMICAL PHYSICS LETTERS, 1994, 229 (03) :317-322

[3] Semiconductor nanocrystals as fluorescent biological labels [J].

Bruchez, M ;

Moronne, M ;

Gin, P ;

Weiss, S ;

Alivisatos, AP .

SCIENCE, 1998, 281 (5385) :2013-2016

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

Chan, WCW ;

Nie, SM .

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

[5] 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

[6] Color-selective semiconductor nanocrystal laser [J].

Eisler, HJ ;

Sundar, VC ;

Bawendi, MG ;

Walsh, M ;

Smith, HI ;

Klimov, V .

APPLIED PHYSICS LETTERS, 2002, 80 (24) :4614-4616

[7] Photoluminescence spectroscopy of single CdSe nanocrystallite quantum dots [J].

Empedocles, SA ;

Norris, DJ ;

Bawendi, MG .

PHYSICAL REVIEW LETTERS, 1996, 77 (18) :3873-3876

[8] Optical transitions in charged CdSe quantum dots [J].

Franceschetti, A ;

Zunger, A .

PHYSICAL REVIEW B, 2000, 62 (24) :R16287-R16290

[9] Fast voltammetric and electrochromic response of semiconductor nanocrystal thin films [J].

Guyot-Sionnest, P ;

Wang, C .

JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (30) :7355-7359

[10] Semiconducting and metallic polymers: The fourth generation of polymeric materials [J].

Heeger, AJ .

MRS BULLETIN, 2001, 26 (11) :900-904