Origin and tunability of dual color emission in highly stable Mn doped CsPbCl 3 nanocrystals grown by a solid-state process
Herein, we report on a facile, bulk scale room temperature solid-state synthesis of highly stable and luminescent Mn-doped CsPbCl nanocrystal (NCs) with high Mn substitution, and investigate the origin and tunability of its dual-color emission. The structural and compositional analyses confirm the s...
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Veröffentlicht in: | Journal of colloid and interface science 2020-03, Vol.564, p.357 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Herein, we report on a facile, bulk scale room temperature solid-state synthesis of highly stable and luminescent Mn-doped CsPbCl
nanocrystal (NCs) with high Mn substitution, and investigate the origin and tunability of its dual-color emission. The structural and compositional analyses confirm the successful doping of Mn (1-40%) ion in CsPbCl
NCs. The Mn-doped CsPbCl
NCs exhibit distinct excitonic photoluminescence (PL) emission at ~412 nm (I
) and Mn related emission at ~590 nm (I
) with high PL quantum yield (up to 35%). Our study reveals that the intensity ratio I
/I
could be widely tuned by a factor of 64 and 23 by changing the Mn concentration and the measurement temperature, respectively. The stronger Mn emission at higher temperature is attributed to the higher rate of transfer of photoexcited carriers from the excitonic state of CsPbCl
host to Mn related state. Further, excitation intensity-dependent PL along with time-resolved PL studies revealed important insights into the origin and tunability of Mn related orange-red PL in the dual color emitting Mn-doped CsPbCl
NCs. The PL line shape analysis revealed additional PL peak in the range ~634-666 nm, which grows stronger with higher doping concentration and it is attributed, for the first time, to structural defects in the NCs. Remarkably, the Mn-doped CsPbCl
NCs synthesized by our method exhibit about 10 times higher storage stability than those reported earlier due to the high Mn doping efficiencies achieved due to the strain induced enhanced doping process. Finally, white light emitting diodes (LEDs) were fabricated by employing blue-emitting CsPbCl
Br
NCs, green-emitting CsPbBr
NCs and orange-red emitting 10% Mn-doped CsPbCl
NCs all grown by the same method. Our work demonstrates a low-cost synthesis strategy for high Mn doping in CsPbCl
NCs with superior ambient stability and highly tunable emission. |
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ISSN: | 1095-7103 |
DOI: | 10.1016/j.jcis.2019.12.066 |