当前位置：
X-MOL 学术
›
J. Phys. Chem. C
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Down- and Upconversion Phenomena in Gd3(Al,Ga)5O12 Crystals Doped with Pr3+ and Yb3+ Ions
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-05-25 00:00:00 , DOI: 10.1021/acs.jpcc.8b03441 J. Komar 1 , R. Lisiecki 1 , R. Kowalski 1 , B. Macalik 1 , P. Solarz 1 , M. Głowacki 2 , M. Berkowski 2 , W. Ryba-Romanowski 1
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2018-05-25 00:00:00 , DOI: 10.1021/acs.jpcc.8b03441 J. Komar 1 , R. Lisiecki 1 , R. Kowalski 1 , B. Macalik 1 , P. Solarz 1 , M. Głowacki 2 , M. Berkowski 2 , W. Ryba-Romanowski 1
Affiliation
|
Single crystals of Gd3Al2.5Ga2.5O12, single-doped with Pr3+ ions and double-doped with Pr3+ and Yb3+ ions, were fabricated by the Czochralski technique. Transition intensities and relaxation dynamics of Pr3+ ions were determined employing the Judd–Ofelt treatment. Crystal field splitting of excited multiplets of incorporated luminescent ions were determined on the basis of optical spectra recorded at liquid helium temperature. The Pr3+ → Yb3+ energy-transfer phenomena were determined analyzing the effect of Yb3+ concentration on luminescence spectra and decay curves of Pr3+ ions. It was concluded that the observed downconversion phenomenon involves a quantum-cutting mechanism consisting of a two-step energy transfer from Pr3+ to Yb3+. We observed a phenomenon of nonresonant conversion of femtosecond pulses of infrared light into visible Pr3+ emission that was weakly affected by the wavelength of incident light at least in the 1100–1600 nm region. It was concluded that excitation mechanisms consist of multiphoton absorption of incident infrared radiation involving interconfigurational 4f2–4f15d transitions of Pr3+ and/or indirect excitation of Pr3+ ions by energy transfer from electrons created in the conduction band of the host.
中文翻译：
Pr 3+和Yb 3+离子掺杂的Gd 3（Al，Ga）5 O 12晶体中的下转换和上转换现象
通过Czochralski技术制备了单掺杂Pr 3+离子和双掺杂Pr 3+和Yb 3+离子的Gd 3 Al 2.5 Ga 2.5 O 12单晶。Pr 3+离子的跃迁强度和弛豫动力学是通过Judd-Ofelt处理确定的。根据在液氦温度下记录的光谱确定掺入的发光离子的激发多重峰的晶体分裂。分析了Yb 3+的影响，确定了Pr 3+ →Yb 3+的能量转移现象Pr 3+离子的发光光谱和衰减曲线上的浓度。结论是，观察到的下转换现象涉及一种量子切割机理，该机理包括从Pr 3+到Yb 3+的两步能量转移。我们观察到了飞秒脉冲将红外光非共振转换为可见Pr 3+发射的现象，该现象至少在1100-1600 nm范围内受入射光波长的影响很小。结论是，激发机制由入射的红外辐射的多光子吸收组成，涉及Pr 3+的互构4f 2 –4f 1 5d跃迁和/或Pr 3+的间接激发。 离子通过能量从主体导带中产生的电子转移而来。
更新日期：2018-05-25
中文翻译：
Pr 3+和Yb 3+离子掺杂的Gd 3（Al，Ga）5 O 12晶体中的下转换和上转换现象
通过Czochralski技术制备了单掺杂Pr 3+离子和双掺杂Pr 3+和Yb 3+离子的Gd 3 Al 2.5 Ga 2.5 O 12单晶。Pr 3+离子的跃迁强度和弛豫动力学是通过Judd-Ofelt处理确定的。根据在液氦温度下记录的光谱确定掺入的发光离子的激发多重峰的晶体分裂。分析了Yb 3+的影响，确定了Pr 3+ →Yb 3+的能量转移现象Pr 3+离子的发光光谱和衰减曲线上的浓度。结论是，观察到的下转换现象涉及一种量子切割机理，该机理包括从Pr 3+到Yb 3+的两步能量转移。我们观察到了飞秒脉冲将红外光非共振转换为可见Pr 3+发射的现象，该现象至少在1100-1600 nm范围内受入射光波长的影响很小。结论是，激发机制由入射的红外辐射的多光子吸收组成，涉及Pr 3+的互构4f 2 –4f 1 5d跃迁和/或Pr 3+的间接激发。 离子通过能量从主体导带中产生的电子转移而来。
京公网安备 11010802027423号