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Your search keyword '"Chen, Qi-Dai"' showing total 823 results
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823 results on '"Chen, Qi-Dai"'

201. Photonic-Molecule Single-Mode Laser

Author

Ku, Jin-Feng, primary, Chen, Qi-Dai, additional, Ma, Xiu-Wen, additional, Yang, Yue-De, additional, Huang, Yong-Zhen, additional, Xu, Huai-Liang, additional, and Sun, Hong-Bo, additional

Published
2015
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211. Organic Crystals: Fabrication and Characterization of Organic Single Crystal‐Based Light‐Emitting Devices with Improved Contact Between the Metallic Electrodes and Crystal (Adv. Funct. Mater. 45/2014)

Author

Ding, Ran, primary, Feng, Jing, additional, Zhang, Xu‐Lin, additional, Zhou, Wei, additional, Fang, Hong‐Hua, additional, Liu, Yue‐Feng, additional, Chen, Qi‐Dai, additional, Wang, Hai‐Yu, additional, and Sun, Hong‐Bo, additional

Published
2014
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243. Size-dependent one-photon- and two-photon-pumped amplified spontaneous emission from organometal halide CH3NH3PbBr3 perovskite cubic microcrystals.

Author

Zhang, Zhen-Yu, Wang, Hai-Yu, Zhang, Yan-Xia, Li, Kai-Jiao, Zhan, Xue-Peng, Gao, Bing-Rong, Chen, Qi-Dai, and Sun, Hong-Bo

Abstract

In the past few years, organometal halide light-emitting perovskite thin films and colloidal nanocrystals (NCs) have attracted significant research interest in the field of highly purified illuminating applications. However, knowledge of photoluminescence (PL) characteristics, such as amplified spontaneous emission (ASE) of larger-sized perovskite crystals, is still relatively scarce. Here, we presented room-temperature size-dependent spontaneous emission (SE) and ASE of the organometal halide CH3NH3PbBr3 perovskite cubic microcrystals pumped through one-photon-(1P) and two-photon-(2P) excitation paradigms. The results showed that the optical properties of SE and ASE were sensitively dependent on the sizes of perovskite microcrystals irrespective of whether 1P or 2P excitation was used. Moreover, by comparing the spectral results of 1P- and 2P-pumped experiments, 2P pumping was found to be an effective paradigm to reduce thresholds by one order of magnitude. Finally, we carried out fluences-dependent time-resolved fluorescence dynamics experiments to study the underlying effects of these scale-dependent SE and ASE. We found that the photoluminescence (PL) recombination rates sensitively became faster with increasing carriers’ densities, and that the ASE pumped from larger-sized CH3NH3PbBr3 perovskite cubic microcrystals showed faster lifetimes. This work shows that micro-sized perovskite cubic crystals could be the ideal patterns of perovskite materials for realizing ASE applications in the future. [ABSTRACT FROM AUTHOR]

Published
2017
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244. Photoluminescence quenching of inorganic cesium lead halides perovskite quantum dots (CsPbX3) by electron/hole acceptor.

Author

Zhang, Yan-Xia, Wang, Hai-Yu, Zhang, Zhen-Yu, Zhang, Yu, Sun, Chun, Yue, Yuan-Yuan, Wang, Lei, Chen, Qi-Dai, and Sun, Hong-Bo

Abstract

Recently, all-inorganic cesium lead halide perovskites (CsPbX3) quantum dots (QDs) have attracted great attention due to their halogen composition and size tunable band gap engineering, the same physical mechanism that is responsible for excellent performance in light-emitting devices. However, little is known about the time-resolved fluorescence quenching dynamics process of these CsPbX3 QDs. In this article, we present comprehensive contrastive spectral studies on the electron and hole extraction dynamics of CsPbX3 colloidal QDs with and without quencher by time-resolved femtosecond transient absorption (TA) and time-correlated single-photon counting (TCSPC) spectroscopy methods. We have identified that the partial electrons of the conduction band and holes of the valence band of CsPbX3 QDs can be directly extracted by tetracyanoethylene (TCNE) and phenothiazine (PTZ), respectively. Moreover, compared with the CsPbBr3 QDs, the CsPbI3 QDs showed relatively slower charge extraction rates. We also found that the CsPbBr3 QDs with smaller size showed faster carrier recombination rates and photoluminescence (PL) decay lifetime due to the relatively stronger quantum confinement effects. We believe that this study may be useful for realising optimal applications in photovoltaic and light emission devices. [ABSTRACT FROM AUTHOR]

Published
2017
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