The La2Ti2O7：Pr^3＋, which emits red color luminescence upon UV light excitation, is prepared by the conventional high-temperature solid-state method and its luminescent properties are systematically investigated. X-...The La2Ti2O7：Pr^3＋, which emits red color luminescence upon UV light excitation, is prepared by the conventional high-temperature solid-state method and its luminescent properties are systematically investigated. X-ray diffraction, photoluminescence, afterglow emission spectra and long-lasting phosphorescence （LLP） decay curves are used to characterize this phosphor. After irradiation by a 290-nm UV light for 3 rain, the Pr^3＋-doped La2Ti2O7 phosphor emits intense red emitting afterglow from the ^1D2 →^ 3H4 transitions, and its afterglow can be seen with the naked eye in the dark clearly for more than 1 h after removal of the excitation source. The afterglow decay curve of the Pr^3＋-doped La2Ti2O7 phosphor contains a fast decay component and another slow decay one. The possible mechanism of this red light emitting LLP phosphor is also discussed based on the experimental results.展开更多
在现代通信技术高速发展的背景下,无源光网络(Passive Optical Network,PON)技术具有简单、可靠和低成本的特点。在宽带网络工程建设中,做好光分配网(Optical Distribution Network,ODN)光网络建设规划至关重要。从ODN规划的目的、光网...在现代通信技术高速发展的背景下,无源光网络(Passive Optical Network,PON)技术具有简单、可靠和低成本的特点。在宽带网络工程建设中,做好光分配网(Optical Distribution Network,ODN)光网络建设规划至关重要。从ODN规划的目的、光网络光纤物理网结构、ODN光网络存在的问题以及相应解决措施进行论述,以供参考。展开更多
基金Supported by the National Natural Science Foundations of China under Grant No 50872130.
文摘The La2Ti2O7：Pr^3＋, which emits red color luminescence upon UV light excitation, is prepared by the conventional high-temperature solid-state method and its luminescent properties are systematically investigated. X-ray diffraction, photoluminescence, afterglow emission spectra and long-lasting phosphorescence （LLP） decay curves are used to characterize this phosphor. After irradiation by a 290-nm UV light for 3 rain, the Pr^3＋-doped La2Ti2O7 phosphor emits intense red emitting afterglow from the ^1D2 →^ 3H4 transitions, and its afterglow can be seen with the naked eye in the dark clearly for more than 1 h after removal of the excitation source. The afterglow decay curve of the Pr^3＋-doped La2Ti2O7 phosphor contains a fast decay component and another slow decay one. The possible mechanism of this red light emitting LLP phosphor is also discussed based on the experimental results.
文摘在现代通信技术高速发展的背景下,无源光网络(Passive Optical Network,PON)技术具有简单、可靠和低成本的特点。在宽带网络工程建设中,做好光分配网(Optical Distribution Network,ODN)光网络建设规划至关重要。从ODN规划的目的、光网络光纤物理网结构、ODN光网络存在的问题以及相应解决措施进行论述,以供参考。
