Bright Blue Emitting Cu-Doped Cs2ZnCl4 Colloidal Nanocrystals
Posted on 2020-06-22 - 16:05
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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Zhu, Dongxu; Zaffalon, Matteo L.; Pinchetti, Valerio; Brescia, Rosaria; Moro, Fabrizio; Fasoli, Mauro; et al. (2020). Bright Blue Emitting Cu-Doped Cs2ZnCl4 Colloidal Nanocrystals. ACS Publications. Collection. https://doi.org/10.1021/acs.chemmater.0c02017
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AUTHORS (12)
DZ
Dongxu Zhu
MZ
Matteo L. Zaffalon
VP
Valerio Pinchetti
RB
Rosaria Brescia
FM
Fabrizio Moro
MF
Mauro Fasoli
MF
Marco Fanciulli
AT
Aiwei Tang
II
Ivan Infante
LD
Luca De Trizio
SB
Sergio Brovelli
LM
Liberato Manna
KEYWORDS
undoped Cs 2 ZnCl 4 NCsCu-doped Cs 2 ZnCl 4 NCsPL quantumtheory calculationsradiation detectionCu-doped Cs 2 ZnCl 4 nanocrystalsintragap photoluminescenceCu concentrationsradio-luminescence emissionresonance analysisCu-doped samplesemission bandPL emissionZnCl 4 tetrahedraCu ionscrystal structureband-edge absorptionX-ray excitationBright Blue Emitting Cu-Doped Cs 2 ...