Metal halide perovskites have rapidly emerged as outstanding semiconductors for laser applications.Surface plasmon resonances of metals offer a platform for improving the perovskite lasing properties of metal halide p...Metal halide perovskites have rapidly emerged as outstanding semiconductors for laser applications.Surface plasmon resonances of metals offer a platform for improving the perovskite lasing properties of metal halide perovskites by accelerating radiative recombination.However,the constraint on degrees of freedom of perovskite-metal interactions in two dimensions keeps us from getting a full picture of plasmon-involved carrier dynamics and reaching the optimum perovskite lasing performance.Here we report a strategy of synthesizing quantitative coassemblies of perovskite and metal nanocrystals for studying the effect of surface plasmons on carrier dynamics in depth and exploring plasmon-enhanced perovskite lasing performance.Within the coassembly,each metal nanocrystal supports localized surface plasmon resonances capable of accelerating radiative recombination of all adjacent perovskite nanocrystals in three dimensions.The quantitative coassemblies disclose the evolution of radiative and nonradiative recombination processes in perovskite nanocrystals with the plasmon modes,identifying an optimal metal nanocrystal content for fulfilling the highest radiative efficiency in perovskite nanocrystals.By virtue of accelerated radiative recombination,the coassemblies of perovskite and metal nanocrystals allowed for the construction of microlaser arrays with enhanced performance including low thresholds and ultrafast outputs.This work fundamentally advances the perovskite-metal systems for plasmonically enhancing perovskite optoelectronic performance.展开更多
Objective To evaluate the effects of retinoic acid （RA） on expression of bone morphogenetic protein 7 （ BMP-7 ） in rat fetus with cleft palate, and the effects of RA on proliferation and apoptosis of osteoblasts. ...Objective To evaluate the effects of retinoic acid （RA） on expression of bone morphogenetic protein 7 （ BMP-7 ） in rat fetus with cleft palate, and the effects of RA on proliferation and apoptosis of osteoblasts. Methods All-trans RA （ATRA） was used to induce congenital cleft palate in Wistar rat. BMP-7 mRNA expression in maxillary bone tissue of fetal rats was measured by Northern blotting analysis. Flow cytometry and MTF assay were used to measure the apoptosis and proliferation of ATRA-treated MC-3T3-E1 cells. BMP-7 mRNA and protein expressions in ATRA-treated MC-3T3-E1 cells were detected by RT-PCR and Western blotting analysis. Remilts ATRA could induce cleft palate of rat fetus. The incidence rate of cleft palate induced by 100 mg/kg AT-RA （45.5%） was significantly higher than 50 mg/kg ATRA （ 12.5%, P 〈 0. 05 ）. BMP-7 mRNA expression decreased in maxillary bone tissue of rat fetus with cleft palate. MC-3T3-E1 cells proliferation treated with 1 × 10^-6 mol/L ATRA decreased by 60%, the cell apoptosis increased by 2 times. BMP-7 mRNA and protein levels in MC-3T3-E1 cells treated with 1 × 10^-6 mol/L ATRA decreased by 60% and 80%, respectively, compared with ATRA-untreated cells （ P 〈 0.05 ）. Conclusions BMP-7 may play an important role in embryonic palate development. RA may possess the ability to down-regulate cell proliferation through regulation of BMP-7 gene expression.展开更多
基金supported by the National Natural Science Foundation of China(Nos.52272186,22090023 and 22375207)Beijing Institute of Technology Research Fund Program for Young Scholars(No.XSQD-6120220081)
文摘Metal halide perovskites have rapidly emerged as outstanding semiconductors for laser applications.Surface plasmon resonances of metals offer a platform for improving the perovskite lasing properties of metal halide perovskites by accelerating radiative recombination.However,the constraint on degrees of freedom of perovskite-metal interactions in two dimensions keeps us from getting a full picture of plasmon-involved carrier dynamics and reaching the optimum perovskite lasing performance.Here we report a strategy of synthesizing quantitative coassemblies of perovskite and metal nanocrystals for studying the effect of surface plasmons on carrier dynamics in depth and exploring plasmon-enhanced perovskite lasing performance.Within the coassembly,each metal nanocrystal supports localized surface plasmon resonances capable of accelerating radiative recombination of all adjacent perovskite nanocrystals in three dimensions.The quantitative coassemblies disclose the evolution of radiative and nonradiative recombination processes in perovskite nanocrystals with the plasmon modes,identifying an optimal metal nanocrystal content for fulfilling the highest radiative efficiency in perovskite nanocrystals.By virtue of accelerated radiative recombination,the coassemblies of perovskite and metal nanocrystals allowed for the construction of microlaser arrays with enhanced performance including low thresholds and ultrafast outputs.This work fundamentally advances the perovskite-metal systems for plasmonically enhancing perovskite optoelectronic performance.
基金Supported by National Natural Science Foundation of China(30500414)Scientific Research Project in Department of Education of Liaoning Province(05L508,20061010)
文摘Objective To evaluate the effects of retinoic acid （RA） on expression of bone morphogenetic protein 7 （ BMP-7 ） in rat fetus with cleft palate, and the effects of RA on proliferation and apoptosis of osteoblasts. Methods All-trans RA （ATRA） was used to induce congenital cleft palate in Wistar rat. BMP-7 mRNA expression in maxillary bone tissue of fetal rats was measured by Northern blotting analysis. Flow cytometry and MTF assay were used to measure the apoptosis and proliferation of ATRA-treated MC-3T3-E1 cells. BMP-7 mRNA and protein expressions in ATRA-treated MC-3T3-E1 cells were detected by RT-PCR and Western blotting analysis. Remilts ATRA could induce cleft palate of rat fetus. The incidence rate of cleft palate induced by 100 mg/kg AT-RA （45.5%） was significantly higher than 50 mg/kg ATRA （ 12.5%, P 〈 0. 05 ）. BMP-7 mRNA expression decreased in maxillary bone tissue of rat fetus with cleft palate. MC-3T3-E1 cells proliferation treated with 1 × 10^-6 mol/L ATRA decreased by 60%, the cell apoptosis increased by 2 times. BMP-7 mRNA and protein levels in MC-3T3-E1 cells treated with 1 × 10^-6 mol/L ATRA decreased by 60% and 80%, respectively, compared with ATRA-untreated cells （ P 〈 0.05 ）. Conclusions BMP-7 may play an important role in embryonic palate development. RA may possess the ability to down-regulate cell proliferation through regulation of BMP-7 gene expression.
