Exploring the fine-structure of cesium lead bromide(CsPbBr3)perovskite nanocrystals(NCs)is not only vital to fundamental understanding of recombination mechanism of exciton but also crucial for improving the performan...Exploring the fine-structure of cesium lead bromide(CsPbBr3)perovskite nanocrystals(NCs)is not only vital to fundamental understanding of recombination mechanism of exciton but also crucial for improving the performance of quantum light emitters and spintronic devices Herein,utilizing low-temperature magneto-photoluminescence(PL)measurement,we provide the direct PL spectral feature of the dark exciton in CsPbBr3 single crystal,and demonstrate that the singlet dark exciton is located^20 meV below the triplet bright exciton.Furthermore,no significant polarization effect was measured from magnetic-polarization method,indicating that there is no spin selectivity for dark exciton.展开更多
Although plasmonic nanostructure has attracted widespread research interest in recent years, it is still a major challenge to realize large-scale active plasmonic nanostructure operation in the visible optical frequen...Although plasmonic nanostructure has attracted widespread research interest in recent years, it is still a major challenge to realize large-scale active plasmonic nanostructure operation in the visible optical frequency. Herein,we demonstrate a heterostructure geometry comprising a centimeter-scale Au nanoparticle monolayer and VO_2 films, in which the plasmonic peak is inversely tuned between 685 nm and 618 nm by a heating process since the refractive index will change when VO_2 films undergo the transition between the insulating phase and the metallic phase. Simultaneously, the phase transition of VO_2 films can be improved by plasmonic arrays due to plasmonic enhanced light absorption and the photothermal effect. The phase transition temperature for Au∕VO_2 films is lower than that for bare VO_2 films and can decrease to room temperature under the laser irradiation. For lightinduced phase transition of VO_2 films, the laser power of Au∕VO_2 film phase transition is ~28.6% lower than that of bare VO_2 films. Our work raises the feasibility to use active plasmonic arrays in the visible region.展开更多
基金financially supported by the National Natural Science Foundation of China(51872039 and 52021001)the Science and Technology Program of Sichuan(M112018JY0025)。
基金supported by the National Natural Science Foundation of China(51602040,51872039,51525202 and 51902098)the Science and Technology Program of Sichuan(M112018JY0025)+1 种基金Scientific Research Foundation for New Teachers of UESTC(A03013023601007)the Ministry of Science and Technology of China(MOST,2016YFA0300802)。
文摘Exploring the fine-structure of cesium lead bromide(CsPbBr3)perovskite nanocrystals(NCs)is not only vital to fundamental understanding of recombination mechanism of exciton but also crucial for improving the performance of quantum light emitters and spintronic devices Herein,utilizing low-temperature magneto-photoluminescence(PL)measurement,we provide the direct PL spectral feature of the dark exciton in CsPbBr3 single crystal,and demonstrate that the singlet dark exciton is located^20 meV below the triplet bright exciton.Furthermore,no significant polarization effect was measured from magnetic-polarization method,indicating that there is no spin selectivity for dark exciton.
基金National Natural Science Foundation of China(NSFC)(51602040)Scientific Research Foundation for New Teachers of University of Electronic Science and Technology of China(UESTC)(A03013023601007,ZYGX2015KYQD057)
文摘Although plasmonic nanostructure has attracted widespread research interest in recent years, it is still a major challenge to realize large-scale active plasmonic nanostructure operation in the visible optical frequency. Herein,we demonstrate a heterostructure geometry comprising a centimeter-scale Au nanoparticle monolayer and VO_2 films, in which the plasmonic peak is inversely tuned between 685 nm and 618 nm by a heating process since the refractive index will change when VO_2 films undergo the transition between the insulating phase and the metallic phase. Simultaneously, the phase transition of VO_2 films can be improved by plasmonic arrays due to plasmonic enhanced light absorption and the photothermal effect. The phase transition temperature for Au∕VO_2 films is lower than that for bare VO_2 films and can decrease to room temperature under the laser irradiation. For lightinduced phase transition of VO_2 films, the laser power of Au∕VO_2 film phase transition is ~28.6% lower than that of bare VO_2 films. Our work raises the feasibility to use active plasmonic arrays in the visible region.
