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Long-lasting photoluminescence quantum yield of cesium lead halide perovskite-type quantum dots

Frontiers of Chemical Science and Engineering 2021年第1期15卷 187-197页

作者： Yonghyun Kim Huiwen Liu Yi Liu Boa Jin Hao Zhang Wenjing Tian Chan Im Department of Chemistry Konkuk UniversitySeoul 05029Korea State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Cesium lead halide perovskite(CsPbX_(3),X=Cl,Br,I)quantum dots(qds)and their partly Mn^(2+)-substituted qds(CsPb1–xMnxX3)attract considerable attention owing to their unique photoluminescence(PL)*** two types of qds,having different PL decay dynamics,needed to be further investigated in a form of aggregates to understand their solid-state-induced exciton dynamics in conjunction with their behaviors upon degradation to achieve practical applications of those promising ***,thus far,these qds have not been sufficiently investigated to obtain deep insights related to the long-term stability of their PL properties as aggregated ***,in this study,we comparatively examined CsPbX_(3)-and CsPb1–xMnxX_(3)-type qds stocked for>50 d under dark ambient conditions by using excitation wavelength-dependent PL quantum yield and time-resolved PL *** investigations were performed with powder samples in addition to solutions to determine the influence of the inter-qd interaction of the aged qd aggregates on their radiative *** turns out that the Mn^(2+)-substituted qds exhibited long-lasting PL quantum efficiencies,while the unsubstituted CsPbX_(3)-type qds exhibited a drastic reduction of their PL *** the obtained PL traces were clearly sensitive to the sample *** is discussed with the possible interaction depending on the size and distance of the qd aggregates.

关键词： quantum dots cesium lead halide perovskite time-resolved photoluminescence PL quantum yield qd aggregates

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