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231225s2020 xx |||||o 00| ||eng c |
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|a 10.1021/acs.chemmater.0c02017
|2 doi
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|a pubmed25n1078.xml
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|a (DE-627)NLM323701191
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|a (NLM)33814699
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Zhu, Dongxu
|e verfasserin
|4 aut
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|a Bright Blue Emitting Cu-Doped Cs2ZnCl4 Colloidal Nanocrystals
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|c 2020
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 06.04.2021
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a We report here the synthesis of undoped and Cu-doped Cs2ZnCl4 nanocrystals (NCs) in which we could tune the concentration of Cu from 0.7 to 7.5%. Cs2ZnCl4 has a wide band gap (4.8 eV), and its crystal structure is composed of isolated ZnCl4 tetrahedra surrounded by Cs+ cations. According to our electron paramagnetic resonance analysis, in 0.7 and 2.1% Cu-doped NCs the Cu ions were present in the +1 oxidation state only, while in NCs at higher Cu concentrations we could detect Cu(II) ions (isovalently substituting the Zn(II) ions). The undoped Cs2ZnCl4 NCs were non emissive, while the Cu-doped samples had a bright intragap photoluminescence (PL) at ∼2.6 eV mediated by band-edge absorption. Interestingly, the PL quantum yield was maximum (∼55%) for the samples with a low Cu concentration ([Cu] ≤ 2.1%), and it systematically decreased when further increasing the concentration of Cu, reaching 15% for the NCs with the highest doping level ([Cu] = 7.5%). The same (∼2.55 eV) emission band was detected under X-ray excitation. Our density functional theory calculations indicated that the PL emission could be ascribed only to Cu(I) ions: these ions promote the formation of trapped excitons, through which an efficient emission takes place. Overall, these Cu-doped Cs2ZnCl4 NCs, with their high photo- and radio-luminescence emission in the blue spectral region that is free from reabsorption, are particularly suitable for applications in ionizing radiation detection
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|a Journal Article
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|a Zaffalon, Matteo L
|e verfasserin
|4 aut
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|a Pinchetti, Valerio
|e verfasserin
|4 aut
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|a Brescia, Rosaria
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Moro, Fabrizio
|e verfasserin
|4 aut
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1 |
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|a Fasoli, Mauro
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Fanciulli, Marco
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Tang, Aiwei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Infante, Ivan
|e verfasserin
|4 aut
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| 700 |
1 |
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|a De Trizio, Luca
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Brovelli, Sergio
|e verfasserin
|4 aut
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| 700 |
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|a Manna, Liberato
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Chemistry of materials : a publication of the American Chemical Society
|d 1998
|g 32(2020), 13 vom: 14. Juli, Seite 5897-5903
|w (DE-627)NLM098194763
|x 0897-4756
|7 nnas
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| 773 |
1 |
8 |
|g volume:32
|g year:2020
|g number:13
|g day:14
|g month:07
|g pages:5897-5903
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|u http://dx.doi.org/10.1021/acs.chemmater.0c02017
|3 Volltext
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