Multicolor luminescence and triple-mode emission of simple CaTiO3:Pr3+,Er3+ particles for advanced anti-counterfeiting

2020 ◽  
Vol 7 (13) ◽  
pp. 2506-2514 ◽  
Author(s):  
Zhenbin Wang ◽  
Pengxiang Pei ◽  
Dongjie Bai ◽  
Shanshan Zhao ◽  
Xinyu Ma ◽  
...  
Keyword(s):  
Excitation Power ◽  
Excitation Wavelength ◽  
Qr Code ◽  
Triple Mode

The multilevel anticounterfeiting QR code readily integrates the advantages of excitation wavelength-dependent PL emissions, a strong red afterglow and sensitive excitation power-dependent UCL emissions in one overall device.

Triple-Mode Tunable Long-Persistent Luminescence in a 3D Zinc-Organic Hybrid

2021 ◽  
Author(s):  
Yu-Juan Ma ◽  
Xiaoyu Fang ◽  
Guo-Wei Xiao ◽  
Bo Lu ◽  
Dongpeng Yan
Keyword(s):  
Theoretical Calculation ◽  
Excitation Wavelength ◽  
Persistent Luminescence ◽  
Organic Hybrid ◽  
Color Tunable ◽  
Long Lifetime ◽  
Triple Mode

A 3D zinc-organic hybrid [Zn3(D-Cam)3(tib)2]·2H2O (1) exhibits triple-mode dependent (including excitation wavelength, time and temperature) long-persistent luminescence. Experimental and theoretical calculation support the long lifetime and color-tunable afterglow can be...

scholarly journals Persistent Luminescence of ZnGa2 O4 :Cr3+ Transparent Glass Ceramics: Effects of Excitation Wavelength and Excitation Power

2017 ◽  
Vol 2017 (44) ◽  
pp. 5114-5120 ◽  
Author(s):  
Victor Castaing ◽  
Atul D. Sontakke ◽  
Alberto José Fernández-Carrión ◽  
Nadia Touati ◽  
Laurent Binet ◽  
...  
Keyword(s):  
Glass Ceramics ◽  
Excitation Power ◽  
Excitation Wavelength ◽  
Persistent Luminescence ◽  
Transparent Glass

A New Blue, Green and Red Upconversion Emission Nanophosphor: BaZrO3:Er,Yb

2008 ◽  
Vol 8 (12) ◽  
pp. 6425-6430 ◽  
Author(s):  
L. A. Diaz-Torres ◽  
P. Salas ◽  
J. S. Perez-Huerta ◽  
C. Angeles-Chavez ◽  
E. De la Rosa
Keyword(s):  
Perovskite Phase ◽  
Hydrothermal Process ◽  
Blue Emission ◽  
Annealing Treatment ◽  
Upconversion Emission ◽  
Excitation Power ◽  
Excitation Wavelength ◽  
Powder Samples ◽  
First Time ◽  
Facile Hydrothermal Process

Strong Blue, green, and red upconversion emission of Er3+ in nanocrystalline BaZrO3:(Yb3+Er3+) is observed. Powder samples were obtained by a facile hydrothermal process at 100 °C. The as synthesized nanocrystallites preserve a stable cubic perovskite phase under subsequent annealing treatment up to 1000 °C. No other phase or segregation of other compounds was detected. Crystallites sizes were around 115 nm and well faceted. Under IR excitation in the range between 900 and 1050 nm the Er3+ blue emission was almost not present in single Er3+ doped BaZrO3, whereas it became easily observable when Yb3+ was added as codopant. Besides, both green and red upconversion emission or upconverted signal of Er3+ are enhanced by around three orders of magnitude in comparison with the single Er3+ doped BaZrO3. The strong blue emission presents dependence on both excitation power and excitation wavelength. This is the first time that upconversion emission is observed in BaZrO3. A possible mechanism for the upconversion process that leads to the observed blue, green and red emissions under NIR excitation is suggested based on the experimental results.

Spectroscopic Study of Rare Earth Doped Nano-Crystalline Silicon in Sio2 Films

2002 ◽  
Vol 737 ◽  
Author(s):  
C. Rozo ◽  
L. F. Fonseca ◽  
O. Resto ◽  
S. Z. Weisz
Keyword(s):  
Rare Earth ◽  
Annealing Temperature ◽  
Crystalline Silicon ◽  
Power Spectra ◽  
Excitation Power ◽  
Excitation Wavelength ◽  
Pl Spectra ◽  
Nano Crystalline ◽  
Different Temperatures ◽  
Deposited Film

ABSTRACTSi-rich SiO2, Nd-doped Si-rich SiO2 and Nd-doped SiO2 thin films were prepared. Photoluminescence (PL) spectra for visible and infrared were obtained for each as-deposited film. The samples were annealed by steps to different temperatures within the range 600°C-1100°C for 30 minutes at each annealing temperature. PL spectra were obtained at each step and their characteristics were studied. The best annealing temperature for the PL of the rare earth (RE) ions was obtained. The PL spectra of the films were compared with one another. Energy transfer from the silicon nanocrystals (Si nc) to the RE ions is verified using excitation wavelength and excitation power spectra.

scholarly journals Excitation-power-dependent upconversion luminescence competition in single β-NaYbF4:Er microcrystal pumped at 808 nm

2021 ◽  
Author(s):  
Maohui Yuan ◽  
Zining Yang ◽  
Xu Yang ◽  
Linxuan Wang ◽  
Rui Wang ◽  
...  
Keyword(s):  
Continuous Wave ◽  
Upconversion Luminescence ◽  
Excitation Power ◽  
Excitation Intensity ◽  
Excitation Wavelength ◽  
Water Molecules ◽  
Biological Applications ◽  
One Pot ◽  
Color Changes ◽  
Particle Level

Abstract Controlling the upconversion luminescence (UCL) intensity ratio, especially pumped at 808 nm, is of fundamental importance in biological applications due to the water molecules exhibiting low absorption at this excitation wavelength. In this work, a series of β-NaYbF4:Er microrods were synthesized by a simple one-pot hydrothermal method and their intense green (545 nm) and red (650 nm) UCL were experimentally investigated based on single particle level under the excitation of 808 nm continuous-wave (CW) laser. Interestingly, the competition between the green and red UCL can be observed in highly Yb3+-doped microcrystals as the excitation intensity gradually increases, which leads to the UCL color changes from green to orange. However, the microcrystals doped with low Yb3+ concentration keep green color which is independent on the excitation power. Further investigations demonstrate that the cross-relaxation (CR) processes between Yb3+ and Er3+ ions result in the UCL competition.

Tunable afterglow luminescence and triple-mode emissions of thermally activated carbon dots confined within nanoclays

2019 ◽  
Vol 7 (43) ◽  
pp. 13640-13646 ◽  
Author(s):  
Yuchen Deng ◽  
Peng Li ◽  
Haiyan Jiang ◽  
Xu Ji ◽  
Huanrong Li
Keyword(s):  
Activated Carbon ◽  
Carbon Dots ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Excitation Wavelength ◽  
Room Temperature Phosphorescence ◽  
Temperature Variations ◽  
Thermally Activated ◽  
Multi Mode ◽  
Triple Mode

Tunable afterglow luminescence and interesting multi-mode emissions (fluorescence (FL), delayed fluorescence (DF), and room-temperature phosphorescence (RTP)) via excitation wavelength and temperature variations were achieved.

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