Temperature and composition dependent excitonic luminescence and exciton-phonon coupling in CdSeS nanocrystals
文献类型：期刊论文
| 作者 | Gao,Yachen1; Wu,Wenzhi1; Chang,Qing1; Ye,Hong-an1; Yu,Dongqi2 |
| 刊名 | Nanoscale Research Letters
 |
| 出版日期 | 2012-06-08 |
| 卷号 | 7期号:1 |
| 关键词 | 71.35.Aa 71.55.Gs 78.47.jd 78.67.Hc. |
| ISSN号 | 1556-276X |
| DOI | 10.1186/1556-276X-7-301 |
| 通讯作者 | Chang,Qing(changqinghit@yahoo.com.cn) |
| 英文摘要 | AbstractThe yellow- and red-emitting CdSeS nanocrystals (NCs) synthesized through one-step organometallic synthesis method are uniformly assembled in polymethyl methacrylate (PMMA). A higher-energy emission band originates from band-edge excitonic state appeared at low temperature. With the Se dopant concentration increasing, the luminescent spectra of CdSeS NCs have a red-shifted emission peak and a shorter luminescent lifetime, which is attributed to the existence of trapping state caused by surface defect and Se dopant. CdSeS NC shows a shorter luminescence lifetime and higher energy emission peak in PMMA matrix than that in toluene, indicating that the former is more favorable to transfer energy through exciton-phonon coupling. The upconversion luminescence (UCL) is observed using 800?nm femtosecond laser excitation. The pump power dependence demonstrated UCL spectra of yellow-emitting CdSeS NCs has a slope of 2.2, while that of red-emitting CdSeS NCs has a slope of 1.4. The results demonstrate that the two-photon absorption plays a dominating role when Se concentration of CdSeS NCs is lower, while phonon-assisted UCL by one-photon excitation gradually takes place with the amount of Se dopants increasing. |
| 语种 | 英语 |
| WOS记录号 | BMC:10.1186/1556-276X-7-301 |
| 出版者 | Springer New York |
| 源URL | [http://cas-ir.dicp.ac.cn/handle/321008/167100]  |
| 专题 | 大连化学物理研究所_中国科学院大连化学物理研究所 |
| 通讯作者 | Chang,Qing |
| 作者单位 | 1.Heilongjiang University; School of Electronic Engineering 2.Liaoning Normal University; School of Physics and Electronic Technology |
| 推荐引用方式 GB/T 7714 | Gao,Yachen,Wu,Wenzhi,Chang,Qing,et al. Temperature and composition dependent excitonic luminescence and exciton-phonon coupling in CdSeS nanocrystals[J]. Nanoscale Research Letters,2012,7(1). |
| APA | Gao,Yachen,Wu,Wenzhi,Chang,Qing,Ye,Hong-an,&Yu,Dongqi.(2012).Temperature and composition dependent excitonic luminescence and exciton-phonon coupling in CdSeS nanocrystals.Nanoscale Research Letters,7(1). |
| MLA | Gao,Yachen,et al."Temperature and composition dependent excitonic luminescence and exciton-phonon coupling in CdSeS nanocrystals".Nanoscale Research Letters 7.1(2012). |
入库方式： OAI收割
来源：大连化学物理研究所
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