Pressure-Tuned Core/Shell Configuration Transition of Shell Thickness-Dependent CdSe/CdS Nanocrystals
Pressure is adopted as a "clean" tool to achieve a core/shell configuration transition of CdSe/CdS nanocrystals (NCs) from quasi-type II to type I. The pressure-dependent photoluminescence (PL) spectra demonstrate a sudden decrease in PL intensity, because of the enhanced rate of exciton-exciton annihilation of type I structured CdSe/CdS NCs. Likewise, the large decrease in the PL lifetime with pressure confirms that the electron wave function mainly localizes into the CdSe core, indicating the decreased separation of electrons and holes in type I band alignment. We propose that pressure increases the conduction band energy of the CdS shell but hardly changes that of the CdSe core with almost both unchanged valence band energies, thus ultimately increasing the conduction band offsets between the CdSe core and CdS shell to form the type I core/shell configuration. Our studies elucidate the significance of external pressure in determining the electronic and optical properties of core/shell nanomaterials.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2020 |
|---|---|
| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:11 |
|---|---|
| Enthalten in: |
The journal of physical chemistry letters - 11(2020), 3 vom: 06. Feb., Seite 920-926 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Lv, Pengfei [VerfasserIn] |
|---|
| Links: |
|---|
| Themen: |
|---|
| Anmerkungen: |
Date Revised 07.02.2020 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
|---|
| doi: |
10.1021/acs.jpclett.9b03650 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM305555081 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM305555081 | ||
| 003 | DE-627 | ||
| 005 | 20231225121433.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231225s2020 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1021/acs.jpclett.9b03650 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n1018.xml |
| 035 | |a (DE-627)NLM305555081 | ||
| 035 | |a (NLM)31957429 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Lv, Pengfei |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Pressure-Tuned Core/Shell Configuration Transition of Shell Thickness-Dependent CdSe/CdS Nanocrystals |
| 264 | 1 | |c 2020 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Revised 07.02.2020 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Pressure is adopted as a "clean" tool to achieve a core/shell configuration transition of CdSe/CdS nanocrystals (NCs) from quasi-type II to type I. The pressure-dependent photoluminescence (PL) spectra demonstrate a sudden decrease in PL intensity, because of the enhanced rate of exciton-exciton annihilation of type I structured CdSe/CdS NCs. Likewise, the large decrease in the PL lifetime with pressure confirms that the electron wave function mainly localizes into the CdSe core, indicating the decreased separation of electrons and holes in type I band alignment. We propose that pressure increases the conduction band energy of the CdS shell but hardly changes that of the CdSe core with almost both unchanged valence band energies, thus ultimately increasing the conduction band offsets between the CdSe core and CdS shell to form the type I core/shell configuration. Our studies elucidate the significance of external pressure in determining the electronic and optical properties of core/shell nanomaterials | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Sun, Ying |e verfasserin |4 aut | |
| 700 | 1 | |a Sui, Laizhi |e verfasserin |4 aut | |
| 700 | 1 | |a Ma, Zhiwei |e verfasserin |4 aut | |
| 700 | 1 | |a Yuan, Kaijun |e verfasserin |4 aut | |
| 700 | 1 | |a Wu, Guorong |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Chuang |e verfasserin |4 aut | |
| 700 | 1 | |a Fu, Ruijing |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Hanyu |e verfasserin |4 aut | |
| 700 | 1 | |a Xiao, Guanjun |e verfasserin |4 aut | |
| 700 | 1 | |a Zou, Bo |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The journal of physical chemistry letters |d 2010 |g 11(2020), 3 vom: 06. Feb., Seite 920-926 |w (DE-627)NLM195788362 |x 1948-7185 |7 nnns |
| 773 | 1 | 8 | |g volume:11 |g year:2020 |g number:3 |g day:06 |g month:02 |g pages:920-926 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1021/acs.jpclett.9b03650 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 11 |j 2020 |e 3 |b 06 |c 02 |h 920-926 | ||