Impact of exciton fine structure on the energy transfer in magic-sized (CdSe)13 clusters

IF 9 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Jan Bieniek, Woonhyuk Baek, Severin Lorenz, Franziska Muckel, Rachel Fainblat, Taeghwan Hyeon, Gerd Bacher
{"title":"Impact of exciton fine structure on the energy transfer in magic-sized (CdSe)13 clusters","authors":"Jan Bieniek,&nbsp;Woonhyuk Baek,&nbsp;Severin Lorenz,&nbsp;Franziska Muckel,&nbsp;Rachel Fainblat,&nbsp;Taeghwan Hyeon,&nbsp;Gerd Bacher","doi":"10.1007/s12274-024-7108-1","DOIUrl":null,"url":null,"abstract":"<div><p>Magic-sized (CdSe)<sub>13</sub> clusters (MSCs) represent a material class at the boundary between molecules and quantum dots that exhibit a pronounced and well separated excitonic fine structure. The characteristic photoluminescence is composed of exciton bandgap emission and a spectrally broad mid-gap emission related to surface defects. Here, we report on a thermally activated energy transfer from fine-structure split exciton states to surface states by using temperature dependent photoluminescence excitation spectroscopy. We demonstrate that the broad mid-gap emission can be suppressed by a targeted Mn-doping of the MSC leading to the characteristic orange luminescence of the <sup>4</sup>T<sub>1</sub> → <sup>6</sup>A<sub>1</sub> Mn<sup>2+</sup> transition. The energy transfer to the Mn<sup>2+</sup> states is found to be significantly different than the transfer to the surface defect states, as the activation of the dopant emission requires a spin-conserving charge carrier transfer that only dark excitons can provide.\n</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":713,"journal":{"name":"Nano Research","volume":"17 :","pages":"10669 - 10676"},"PeriodicalIF":9.0000,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12274-024-7108-1.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Research","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1007/s12274-024-7108-1","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Magic-sized (CdSe)13 clusters (MSCs) represent a material class at the boundary between molecules and quantum dots that exhibit a pronounced and well separated excitonic fine structure. The characteristic photoluminescence is composed of exciton bandgap emission and a spectrally broad mid-gap emission related to surface defects. Here, we report on a thermally activated energy transfer from fine-structure split exciton states to surface states by using temperature dependent photoluminescence excitation spectroscopy. We demonstrate that the broad mid-gap emission can be suppressed by a targeted Mn-doping of the MSC leading to the characteristic orange luminescence of the 4T16A1 Mn2+ transition. The energy transfer to the Mn2+ states is found to be significantly different than the transfer to the surface defect states, as the activation of the dopant emission requires a spin-conserving charge carrier transfer that only dark excitons can provide.

激子精细结构对magic-size (CdSe)13团簇中能量传递的影响
魔术大小(CdSe)13团簇(MSCs)代表了分子和量子点之间边界的一类材料,表现出明显且分离良好的激子精细结构。其特征光致发光由激子带隙发射和与表面缺陷有关的光谱宽的中隙发射组成。在这里,我们报告了热激活的能量转移,从精细结构分裂激子状态到表面状态,利用温度依赖的光致发光激发光谱。我们证明了通过靶向mn掺杂MSC可以抑制宽中隙发射,从而导致4T1→6A1 Mn2+跃迁的特征橙色发光。发现向Mn2+态的能量转移与向表面缺陷态的能量转移有显著不同,因为掺杂剂发射的激活需要自旋守恒的载流子转移,而这种转移只有暗激子才能提供。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Nano Research
Nano Research 化学-材料科学:综合
CiteScore
14.30
自引率
11.10%
发文量
2574
审稿时长
1.7 months
期刊介绍: Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信