Synthesis and characterization of structural and optical properties of heteroepitaxial brookite TiO2 single crystalline films

2016 ◽  
Vol 115 ◽  
pp. 75-79 ◽  
Author(s):  
Weiguang Wang ◽  
Mingxian Wang ◽  
Zhao Li ◽  
Xuejian Du ◽  
Haisheng Xu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Synthesis And Characterization ◽  
Structural And Optical Properties ◽  
Single Crystalline ◽  
Crystalline Films

scholarly journals Crystallization and Investigation of the Structural and Optical Properties of Ce3+-Doped Y3−xCaxAl5−ySiyO12 Single Crystalline Film Phosphors

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 788
Author(s):  
Vitalii Gorbenko ◽  
Tetiana Zorenko ◽  
Sandra Witkiewicz-Łukaszek ◽  
Anna Shakhno ◽  
Andres Osvet ◽  
...  
Keyword(s):  
Optical Properties ◽  
Light Yield ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Decay Kinetics ◽  
Structural And Optical Properties ◽  
Low Light ◽  
Single Crystalline ◽  
Crystalline Films ◽  
Si Content

This work is devoted to the crystallization and investigation of the optical properties of single crystalline films (SCFs) of Ce3+-doped Y3−xCaxAl5−ySiyO12 garnet, where the content of Ca2+ and Si4+ cations varied in the x = 0.13–0.52 and y = 0.065–0.5 ranges, respectively. The SCF samples were grown using the liquid phase epitaxy technique onto Y3Al5O12 substrates from the melt solution with equimolar Ca and Si content using PbO-B2O3 flux. However, the Ca and Si concentration in Y3−xCax Al5−ySiyO12:Ce SCFs is not equal: the Ca2+ content was systematically larger than that of Si4+, and the Ca2+ excess is compensated for by the Ce4+ ion formation. The absorption, scintillation, and luminescent properties of Y3−xCaxAl5−ySiyO12:Ce SCFs with different Ca/Si concentrations were investigated and compared with the sample of YAG:Ce SCF. Due to the creation of Ce4+ ions, the as-grown Y3−xCaxAl5−ySiyO12:Ce SCFs show relatively low light yield (LY) under α–particle excitation but a fast scintillation response with a decay time in the ns range. After SCF annealing in the reducing (N2 + H2) atmosphere at T > 1000 °C, the recharging of Ce4+→Ce3+ ions occurs. Furthermore, the samples annealed at 1300 °C SCF possess an LY of about 40% in comparison with the reference YAG:Ce SCF and scintillation decay kinetics much closer to that of the SCF counterpart. Due to Ca2+ and Si4+ alloying, the Ce3+ emission spectra in Y3−xCaxAl5−ySiyO12 SCFs are extended to the red range in comparison with the spectra of YAG:Ce SCF. Such an extension is caused by the Ce3+ multicenter formation at the substitutions of both Y3+ and Ca2+ dodecahedral positions in the hosts of these mixed garnets.

scholarly journals Synthesis and characterization of structural and optical properties of Ce, U codoped YAG transparent ceramics

2018 ◽  
Vol 8 (5) ◽  
pp. 1274 ◽  
Author(s):  
Cai Gong ◽  
Jian Chen ◽  
Qiufeng Huang ◽  
Zhonghua Deng ◽  
Zhuguang Liu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Synthesis And Characterization ◽  
Transparent Ceramics ◽  
Structural And Optical Properties

Synthesis and Characterization of Single-crystalline TaC Whiskers

2021 ◽  
pp. 126183
Author(s):  
Jian Zhang ◽  
Lei Zhao ◽  
Hongyu Li ◽  
Fugui Lei ◽  
Liqing Qiao
Keyword(s):  
Synthesis And Characterization ◽  
Single Crystalline
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