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RISS 인기검색어
- 검색키워드
- 저자 : Jingling Li (검색결과 3 건)
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Kaili Qin,Jingling Li,Yanqing Zhu,Xueqing Xu,Xiudi Xiao,Bing Deng,Juan Yang,Zhuoneng Bi,Shuaijun Chen,Gang Xu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8
Crystal structure control is so important to the fluorescence properties that each element should be considered carefully. In conventional synthesis of ZnxCd1-xS alloyed nanocrystals (NCs), most of studies focus on ligand–surface interaction on the formation of either zinc blende or wurtzite ZnxCd1-xS nanocrystals, instead of the reactant source. In this work, mixed crystal phase was found easily in ZnxCd1-xS alloyed NCs when reaction proceeded at high Zn/Cd source ratio condition. Therefore, we regulate the Zn/Cd ratio to obtain relative pure zinc-blende structure, and study the influence of structure change on the fluorescence properties. Further, we have proposed a two-step ZnS coating method to acquire ZnxCd1-xS/ZnS NCs with separated crystal-phase between core and shell. Compared with maximum QY of 81% for ZnxCd1-xS/ZnS NCs synthesized by conventional one-step coating method, the performance of the optimized NCs has significantly improved with maximum QY of 93%.
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Low-Temperature Synthesis of Highly Efficient, Deep-Red Zn-Cu-In-Se/ZnSe Fluorescence Quantum Dots
Juan Yang,Jingling Li,Yanqing Zhu,Xueqing Xu,Xiudi Xiao,Bing Deng,Kaili Qin,Zhuoneng Bi,Shuaijun Chen,Gang Xu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.6
We report a facile synthesis method on CuInSe2 (CISe)-based quantum dots (QDs) by using tri-n-octylphosphine selenium (TOPSe) as selenide precursor, with assistance of oleylamine (OAm) and n-dodecanethiol (DDT). We demonstrate that the OAm and DDT jointly contribute to the formation of the low-temperature-decomposable metal-sulfide clusters, and promote the QD nucleation at relatively low temperature range of 180–200 ℃. Furthermore, to improve fluorescence property, Zn-doping and ZnSe coating are simultaneously carried out. The obtained deep-red ZnCISe/ZnSe QDs possess higher quantum yield of 65% at wavelength of 670 nm, which is in the best performance range ever reported. Then, we investigate the improvement mechanism, where the sufficient Zn replacement of In sites is the crucial factor. This modified core–shell structure provides two benefits, on the one hand, the enhancement on intrinsic defect-related recombination, and the other hand, the improved core–shell interface that reduces the nonradiative recombination.
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Characteristics of Tower‑Level Low‑Level Jets and Their Impacts on the Urban Heat Island in Tianjin
Tingting Ju,Bingui Wu,Zongfei Li,Jingle Liu,Hongsheng Zhang 한국기상학회 2023 Asia-Pacific Journal of Atmospheric Sciences Vol.59 No.4
To date, the characteristics of the low-level jets (LLJs) that appear below 300 m, referred to in this study as tower-level LLJs(T-LLJs), have remained unidentified. The results in this study show that approximately 22% of LLJs in Tianjin appear below300 m, indicating that greater attention should be given to T-LLJs. Thus, the characteristics of T-LLJs in Tianjin are investigatedusing data obtained from a wind-profile radar and a 255-m high meteorological tower. The results show that T-LLJsfrequently occur during the transition from the warm season to the cold season and prefer to appear at night. Compared tothe LLJs that appear between 300 and 1000 m, T-LLJs exhibit distinct monthly and diurnal variations, likely attributable tospecific underlying causes. The case study suggests that the generation of T-LLJs can be partly attributed to inertial oscillation. Moreover, sensitivity tests indicate that the land‒sea thermal contrast is one of the main causes of T-LLJs, and thaturban heat islands (UHIs) exert nonnegligible influence on T-LLJs in Tianjin. In addition, since UHIs are mainly nocturnalphenomena, the impacts of nocturnal LLJs on UHIs are investigated. The results show that nocturnal LLJs contribute toenhance turbulent mixing and heat transport, which can weaken atmospheric stability near the surface. Consequently, anocturnal UHI is always weaker when it occurs concurrently with a LLJ, as opposed to occurring without a LLJ.
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