GSTDTAP  > 气候变化
DOI10.1111/gcb.13379
Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy
Fan, Fengjia1; Voznyy, Oleksandr1; Sabatini, Randy P.1; Bicanic, Kristopher T.1; Adachi, Michael M.1,7; McBride, James R.2; Reid, Kemar R.2; Park, Young-Shin3,4; Li, Xiyan1; Jain, Ankit1; Quintero-Bermudez, Rafael1; Saravanapavanantham, Mayuran1; Liu, Min1; Korkusinski, Marek5; Hawrylak, Pawel6; Klimov, Victor I.3; Rosenthal, Sandra J.2; Hoogland, Sjoerd1; Sargent, Edward H.1
2017-04-06
发表期刊NATURE
ISSN0028-0836
EISSN1476-4687
出版年2017
卷号544期号:7648页码:75-+
文章类型Article
语种英语
国家Canada; USA
英文摘要

Colloidal quantum dots (CQDs) feature a low degeneracy of electronic states at the band edges compared with the corresponding bulk material(1), as well as a narrow emission linewidth(2,3). Unfortunately for potential laser applications, this degeneracy is incompletely lifted in the valence band, spreading the hole population among several states at room temperature(4-6). This leads to increased optical gain thresholds, demanding high photoexcitation levels to achieve population inversion (more electrons in excited states than in ground states-the condition for optical gain). This, in turn, increases Auger recombination losses(7), limiting the gain lifetime to sub-nanoseconds and preventing steady laser action(8,9). State degeneracy also broadens the photoluminescence linewidth at the single-particle level(10). Here we demonstrate a way to decrease the band-edge degeneracy and single-dot photoluminescence linewidth in CQDs by means of uniform biaxial strain. We have developed a synthetic strategy that we term facet-selective epitaxy: we first switch off, and then switch on, shell growth on the (0001) facet of wurtzite CdSe cores, producing asymmetric compressive shells that create built-in biaxial strain, while still maintaining excellent surface passivation (preventing defect formation, which otherwise would cause non-radiative recombination losses). Our synthesis spreads the excitonic fine structure uniformly and sufficiently broadly that it prevents valence-band-edge states from being thermally depopulated. We thereby reduce the optical gain threshold and demonstrate continuous-wave lasing from CQD solids, expanding the library of solution-processed materials(11,12) that may be capable of continuous-wave lasing. The individual CQDs exhibit an ultranarrow single-dot linewidth, and we successfully propagate this into the ensemble of CQDs.


领域地球科学 ; 气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000398323300035
WOS关键词AUGER RECOMBINATION ; STIMULATED-EMISSION ; SHELL NANOCRYSTALS ; OPTICAL GAIN ; CDSE ; THRESHOLD ; EXCITON ; SEMICONDUCTORS ; SURFACE ; PHOTOLUMINESCENCE
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/17427
专题气候变化
资源环境科学
作者单位1.Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada;
2.Vanderbilt Univ, Vanderbilt Inst Nanoscale Sci & Engn, 221 Kirkland Hall, Nashville, TN 37235 USA;
3.Los Alamos Natl Lab, Div Chem, Los Alamos, NM 87545 USA;
4.Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87131 USA;
5.CNR, Emerging Technol Div, Secur & Disrupt Technol, Ottawa, ON K1A 0R6, Canada;
6.Univ Ottawa, Dept Phys, Ottawa, ON K1A 0R6, Canada;
7.Simon Fraser Univ, Sch Engn Sci, 8888 Univ Dr Burnaby, Burnaby, BC V5A IS6, Canada
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GB/T 7714
Fan, Fengjia,Voznyy, Oleksandr,Sabatini, Randy P.,et al. Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy[J]. NATURE,2017,544(7648):75-+.
APA Fan, Fengjia.,Voznyy, Oleksandr.,Sabatini, Randy P..,Bicanic, Kristopher T..,Adachi, Michael M..,...&Sargent, Edward H..(2017).Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy.NATURE,544(7648),75-+.
MLA Fan, Fengjia,et al."Continuous-wave lasing in colloidal quantum dot solids enabled by facet-selective epitaxy".NATURE 544.7648(2017):75-+.
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