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DOI | 10.1111/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
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ISSN | 0028-0836 |
EISSN | 1476-4687 |
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 |
推荐引用方式 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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