Infrared-to-visible upconversion in Nd 3 + -doped chalcohalide glasses
Infrared-to-visible upconversion in Nd 3 + -doped chalcohalide glasses
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DOI：
10.1103/physrevb.64.144101
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发表时间：
2001-09
影响因子：
3.7
通讯作者：
R. Balda;M. Sanz;A. Mendioroz;J. Fernández;L. Griscom;J. Adam
中科院分区：
文献类型：
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作者：
R. Balda;M. Sanz;A. Mendioroz;J. Fernández;L. Griscom;J. Adam
利用稳态和时间分辨激光光谱技术研究了不同卤化物改性剂${\ mathm {Nd}}^{3+}$掺杂的胆卤玻璃的红外到可见光上转换过程。根据红外激发波长的不同，确定了两种不同的上转换机制。当激发波长与${}^{4}{F}_{3/2}$共振时，在538、600和675 nm处观测到三个主要波段，并归因于${}}^{4}{G}_{7/2}$能级的发射。在${}^{4}{F}_{3/2}$状态下，两个钕离子通过能量转移发生上转换。然而，在能量高于${}^{4}{F}_{3/2}$的非共振激发（介于${}}^{4}{F}_{3/2}$和${}}^{4}{F}_{5/2}$之间）$或与${}}^{4}{F}_{5/2}$共振时，会导致额外的蓝色发射来自${}}^{2}{P}_{1/2}$状态。后一种上转换发射可归因于泵浦辐射的激发态吸收。红外脉冲激发后上转换发光的时间演化和上转换发光激发光谱支持了${}^{2}{P}_{1/2}$和${}}^{4}{G}_{7/2}$能级不同发射的上转换机理。
The infrared to visible upconversion processes have been investigated for ${\mathrm{Nd}}^{3+}$-doped chalcohalide glasses with different halide modifiers by using steady-state and time-resolved laser spectroscopy. Two different upconversion mechanisms have been identified depending on the infrared excitation wavelength. When the excitation wavelength is resonant with the ${}^{4}{F}_{3/2}$ state, three main bands at 538, 600, and 675 nm are observed and attributed to emissions from the ${}^{4}{G}_{7/2}$ level. These upconverted emissions occur via energy-transfer upconversion involving two neodymium ions in the ${}^{4}{F}_{3/2}$ state. However, nonresonant excitation at higher energies than that of ${}^{4}{F}_{3/2}$ state (between states ${}^{4}{F}_{3/2}$ and ${}^{4}{F}_{5/2})$ or in resonance with the ${}^{4}{F}_{5/2}$ state, causes an additional blue emission to originate from the ${}^{2}{P}_{1/2}$ state. This latter upconverted emission can be attributed to excited-state absorption of the pump radiation. The proposed upconversion mechanisms responsible for the different emissions from levels ${}^{2}{P}_{1/2}$ and ${}^{4}{G}_{7/2}$ are supported by both the time evolution of the upconversion luminescence after infrared pulsed excitation and the upconversion luminescence excitation spectra.