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| 1 | Ultrafast optical nonlinearity of blue-emitting perovskite nanocrystals显示文摘Perovskite nanocrystals(NCs) have strong nonlinear optical responses with a number of potential applications,ranging from upconverted blue-lasing to the tagging of specific cellular components in multicolor fluorescence microscopy. Here, we determine the one-photon linear absorption cross section of two kinds of blue-emitting perovskite NCs, i.e., CsPbCl_3 and CsPb(Cl_(0.53)Br_(0.47))_3, by utilizing femtosecond transient absorption spectroscopy. The wavelength-dependent nonlinear refraction and two-photon absorption have been measured at wavelengths from 620 to 720 nm by performing Z-scan measurements. The nonlinear optical responses of CsPb(Cl_(0.53)Br_(0.47))_3 are much more pronounced than those of CsPbCl_3 due to the larger structural destabilization of the former. | JUNZI LI CAN REN XIN QIU XIAODONG LIN RUI CHEN CHENG YIN TINGCHAO HE | 2018 | Photonics Research2018，6，6： | 3 |
| 2 | Linear and nonlinear photophysical properties of ZnSe/CdS/ZnS core/shell/shell typeⅡnanocrystals显示文摘In this work,one kind of typeⅡZnSe/CdS/ZnS core/shell/shell nanocrystals(NCs)is synthesized,and their linear and nonlinear photophysical properties are investigated.Through measurements of the temperaturedependent photoluminescence spectra of NCs,their excitonic properties,including the coefficient of the bandgap change,coupling strength of the exciton acoustic phonons,exciton longitudinal optical(LO)phonons,and LO–phonon energy are revealed.Femtosecond transient absorption spectroscopy was employed to obtain insight into ultrafast processes occurring at the interface of ZnSe and CdS,such as those involving the injection of photoinduced electrons into the CdS shell,interfacial state bleaching,and charge separation time.At the end,their multiphoton absorption spectra were determined by using the z-scan technique,which yielded a maximum twophoton absorption cross section of 3717 GM at 820 nm and three-photon absorption cross section up to 3.9×10^-77cm^6·s^2·photon^-2at 1220 nm,respectively.The photophysical properties presented here may be important for exploiting their relevant applications in optoelectronic devices and deep-tissue bioimaging. | YANG GAO XIN QIU FULI ZHAO SHUYU XIAO JUNZI LI XIAODONG LIN RUI CHEN AND TINGCHAO HE | 2020 | Photonics Research2020，8，9： | 1 |
| 3 | Superior multiphoton absorption properties in colloidal Mn-doped CsPbCl3two-dimensional nanoplatelets显示文摘We have studied the two-and three-photon absorption(2PA and 3PA) properties of Mn-doped CsPbCl_3 twodimensional nanoplatelets(2D NPs) and cubic nanocrystals. Compared with their cubic counterparts, the Mn-doped 2D NPs exhibit stronger quantum confinement effects that can more efficiently enhance their dopantcarrier exchange interactions and multiphoton absorption. More specifically, the maximum volume-normalized 2PA and 3PA cross sections of the 2D NPs were 6.8 and 7.2 times greater than those of their cubic counterparts,respectively, reaching up to 1237 GM∕nm^3 in the visible light band and 2.24 × 10^(-78) cm^6· s^2· photon^(-2)∕nm^3 in the second biological window, respectively. | TINGCHAO HE JUNZI LI XIN QIU SHUYU XIAO XIAODONG LIN | 2018 | Photonics Research2018，，11： | 0 |
| 4 | Informal Sector Employment and Consumption Pattems in China显示文摘 | Junzi He Bo Li | 2016 | Journal of US-China Public Administration2016，13，3： | 0 |
| 5 | Factors Influencing Breast-Feeding Among Women in China显示文摘 | Junzi He | 2016 | Journal of Sociology Study2016，6，6： | 0 |
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