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树形分子包覆硫化镉量子点的抗老化性能研究 丛日敏1,于怀清1,罗运军3 (1.山东理工大学,材料科学与工程学院,淄博255049;2.北京理工大学材料科学与工程学院,北京100081;3.北京理工大学材料科学与工程学院,北京,100081) 摘要:以聚酰胺-胺树形分子为模板制备了平均粒径为2.5nm的CdS量子点,采用HRTEM,EDS,UV-vis,PL等手段对样品进行表征,研究了其在室温避光条件下的老化过程.结果表明,CdS量子点在刚制备的前5d里UV-vis,PL谱峰半峰宽变窄,发光效率迅速上升,表明量子点以尺寸窄化生长为主;5d后UV-vis,PL谱峰半峰宽逐渐宽化,发光效率缓慢下降,表明量子点以尺寸宽化(Ostwald熟化)过程为主.树形分子的配位作用和模板作用赋予CdS量子点良好的抗老化性能,6个月后量子点粒径增量 关键词:CdS量子点; PAMAM树形分子; 光致发......
implantation damages. The photoluminescence (PL), PL excitation (PLE), and PL kinetics have been studied with continuous and pulse photo-excitations in 360-1100 nm spectral range at different temperatures. The characteristic Yb3+ ion emission spectra were observed in the spectral range between 970-1050 nm. Theoretical fittings of the experimental PL temperature and PL kinetics data suggest......
:Radio-photoluminescence(RPL) is a phenomenon seen in luminescent materials in which the appearance of new photoluminescence(PL) emission is induced by an incident ionizing radiation such as X-rays; and the signal is stable even after the irradiation and during the PL measurement. Since the induced PL intensity is proportional to the irradiation dose......
">In this work, the photoluminescence(PL) of NaScP2O7:Eu2+ and NaScP2O7:Eu2+,Mn2+ was investigated. Phase purity was checked using X-ray powder diffractometry(XRD). PL excitation and emission spectra were recorded to elucidate the PL properties of NaScP2O7:Eu2+ and NaScP2O7:Eu2+,Mn2+. Furthermore, fluorescence lifetime measurements were performed. PL and lifetime measurements were carried out from 10 to 525 K......
·7Al2O3(Tb:C12A7) crystals were synthesized by the floating zone(FZ) method and the photoluminescence(PL), scintillation and thermally-stimulated luminescence(TSL) properties were investigated. The photoluminescence(PL) emission spectra and PL decay time profiles were investigated by using Quantaurus-tau(Hamamatsu). The scintillation spectra and decay time profiles were measured by using our......
excitation energy in this key alloy is thus a key subject of the energy conversion from optical to electrical. In this article we present a study of the subject through investigating photoluminescence(PL) degradation in the GaInP epilayer at 4 K under the continuous optical excitations of ultraviolet(UV) 325 nm, visible 488.0 and 514.5 nm lasers. It is found that the decline of PL intensity......
implantation damages. The photoluminescence (PL), PL excitation (PLE), and PL kinetics have been studied with continuous and pulse photo-excitations in 360-1100 nm spectral range at different temperatures. The characteristic Yb3+ ion emission spectra were observed in the spectral range between 970-1050 nm. Theoretical fittings of the experimental PL temperature and PL kinetics data suggest......
:Radio-photoluminescence(RPL) is a phenomenon seen in luminescent materials in which the appearance of new photoluminescence(PL) emission is induced by an incident ionizing radiation such as X-rays; and the signal is stable even after the irradiation and during the PL measurement. Since the induced PL intensity is proportional to the irradiation dose......
">In this work, the photoluminescence(PL) of NaScP2O7:Eu2+ and NaScP2O7:Eu2+,Mn2+ was investigated. Phase purity was checked using X-ray powder diffractometry(XRD). PL excitation and emission spectra were recorded to elucidate the PL properties of NaScP2O7:Eu2+ and NaScP2O7:Eu2+,Mn2+. Furthermore, fluorescence lifetime measurements were performed. PL and lifetime measurements were carried out from 10 to 525 K......
·7Al2O3(Tb:C12A7) crystals were synthesized by the floating zone(FZ) method and the photoluminescence(PL), scintillation and thermally-stimulated luminescence(TSL) properties were investigated. The photoluminescence(PL) emission spectra and PL decay time profiles were investigated by using Quantaurus-tau(Hamamatsu). The scintillation spectra and decay time profiles were measured by using our......
