Three-photon-excited upconversion luminescence of YVO4 single crystal by infrared femtosecond laser irradiation.
Three-photon-excited upconversion luminescence of YVO4 single crystal by infrared femtosecond laser irradiation.
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DOI：
10.1364/opex.13.010157
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发表时间：
2005-12
期刊：
影响因子：
3.8
通讯作者：
Luyun Yang;Chen Wang;Yongjun Dong;N. Da;X. Hu;Danping Chen;J. Qiu
中科院分区：
文献类型：
--
作者：
Luyun Yang;Chen Wang;Yongjun Dong;N. Da;X. Hu;Danping Chen;J. Qiu
报道了红外飞秒激光激发下纯YVO 4单晶的上转换发光。发光光谱表明，上转换发光来自VO 4 3-的最低激发态3 T1，3 T2到基态1A 1的跃迁。荧光强度与激光泵浦功率密度的关系表明，红外辐射向可见光发射的转换是由三光子激发过程主导的。我们认为，同时吸收的三个红外光子促进VO 4 3-的激发态，这迅速级联下降到最低激发态，并辐射弛豫到基态，导致广泛的特征荧光的VO 4 3-。
We report on the upconversion luminescence of a pure YVO4 single crystal excited by an infrared femtosecond laser. The luminescent spectra show that the upconversion luminescence comes from the transitions from the lowest excited states 3T1, 3T2 to the ground state 1A1 of the VO4 3-. The dependence of the fluorescence intensity on the pump power density of laser indicates that the conversion of infrared irradiation to visible emission is dominated by three-photon excitation process. We suggest that the simultaneous absorption of three infrared photons promotes the VO4 3- to excited states, which quickly cascade down to lowest excited states, and radiatively relax to ground states, resulting in the broad characteristic fluorescence of VO4 3-.