Luminescence, energy-transfer and tunable color properties of single-component Tb3+ and/or Sm3+ doped NaGd(WO4)2 phosphors with UV excitation for use as WLEDs

RSC Advances ◽  
2014 ◽  
Vol 4 (102) ◽  
pp. 58708-58716 ◽  
Author(s):  
Yan Liu ◽  
Guixia Liu ◽  
Xiangting Dong ◽  
Jinxian Wang ◽  
Wensheng Yu
Keyword(s):  
Energy Transfer ◽  
Single Component ◽  
Color Properties ◽  
Color Tunable ◽  
Uv Excitation ◽  
Transfer Mechanisms

Tb3+ and/or Sm3+ codoped NaGd(WO4)2 microcrystals were prepared and energy transfer mechanisms of WO42− → Sm3+ and Tb3+ → Sm3+ were studied. The color-tunable emissions are investigated, for nUV-LED applications.

scholarly journals Optical Investigation of Eu3+ Doped Bi12GeO20 (BGO) Crystals

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 285 ◽  
Author(s):  
M. Kowalczyk ◽  
T.F. Ramazanova ◽  
V.D. Grigoryeva ◽  
V.N. Shlegel ◽  
M. Kaczkan ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Room Temperature ◽  
Transition Probabilities ◽  
Spectroscopic Properties ◽  
Electric Dipole Transition ◽  
Optical Investigation ◽  
Bulk Crystals ◽  
Czochralski Technique ◽  
Uv Excitation ◽  
Transfer Mechanisms

The spectroscopic properties of Eu3+ doped Bi12GeO20 (BGO) sillenite bulk crystals that were grown by the low-thermal-gradient Czochralski technique (LTG Cz) were investigated. The absorption spectra and the emission properties have been measured at room temperature (300 K) and at 10 K. Luminescence was observed both due to the direct Eu3+ ion excitation, as well as under UV excitation due to the energy transfer between Bi3+ and Eu3+ ions. Bi3+ → Eu3+ energy transfer mechanisms in Eu3+:BGO doped host were investigated. The Ωλ parameters, as well as radiative lifetimes, were calculated based upon the Judd-Ofelt formalism. The branching ratios and electric dipole transition probabilities were also determined, based upon the obtained experimental results. Luminescence has been observed from the 5D0,1,2 levels of Eu3+, with emissions from the 5D0 level being the strongest. The strongest observed luminescence band corresponds to the 5D0 → 7F0 transition at 578.7 nm. Reasons for the strong presence of the theoretically forbidden 5D0 → 7F0 emission were investigated.

Luminescence and energy transfer of a color tunable phosphor: Tb3+ and Eu3+ co-doped ScPO4

RSC Advances ◽  
2016 ◽  
Vol 6 (34) ◽  
pp. 28887-28894 ◽  
Author(s):  
Ruiyu Mi ◽  
Jian Chen ◽  
Yan-gai Liu ◽  
Minghao Fang ◽  
Lefu Mei ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Pl Spectra ◽  
Color Tunable ◽  
Uv Excitation ◽  
Co Doped

The PL spectra of ScPO4:0.03Tb3+, yEu3+ (y = 0–0.05) phosphors under N-UV excitation (λex = 370 nm) and the tunable luminescence.

Up/down conversion, tunable photoluminescence and energy transfer properties of NaLa(WO4)2:Er3+,Eu3+ phosphors

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 97995-98003 ◽  
Author(s):  
Yan Liu ◽  
Yanxia Liu ◽  
Guixia Liu ◽  
Xiangting Dong ◽  
Jinxian Wang
Keyword(s):  
Energy Transfer ◽  
Hydrothermal Method ◽  
Single Component ◽  
Transfer Mechanism ◽  
Energy Transfer Mechanism ◽  
Color Tunable ◽  
One Step ◽  
Down Conversion ◽  
Transfer Properties

A series of novel, color-tunable, single-component NaLa(WO4)2:Er3+,Eu3+ phosphors were prepared by a one-step hydrothermal method. The energy transfer mechanism was studied, and color-tunable emissions in NaLa(WO4)2 are realized.

scholarly journals Ultrafast Electron/Energy Transfer and Intersystem Crossing Mechanisms in BODIPY-Porphyrin Compounds

Processes ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 312
Author(s):  
Yusuf Tutel ◽  
Gökhan Sevinç ◽  
Betül Küçüköz ◽  
Elif Akhuseyin Yildiz ◽  
Ahmet Karatay ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectra ◽  
Visible Region ◽  
Energy Transfer Mechanism ◽  
Free Base ◽  
Pump Probe ◽  
Harvesting Efficiency ◽  
Probe Spectroscopy ◽  
Absorption Features ◽  
Transfer Mechanisms

Meso-substituted borondipyrromethene (BODIPY)-porphyrin compounds that include free base porphyrin with two different numbers of BODIPY groups (BDP-TTP and 3BDP-TTP) were designed and synthesized to analyze intramolecular energy transfer mechanisms of meso-substituted BODIPY-porphyrin dyads and the effect of the different numbers of BODIPY groups connected to free-base porphyrin on the energy transfer mechanism. Absorption spectra of BODIPY-porphyrin conjugates showed wide absorption features in the visible region, and that is highly valuable to increase light-harvesting efficiency. Fluorescence spectra of the studied compounds proved that BODIPY emission intensity decreased upon the photoexcitation of the BODIPY core, due to the energy transfer from BODIPY unit to porphyrin. In addition, ultrafast pump-probe spectroscopy measurements indicated that the energy transfer of the 3BDP-TTP compound (about 3 ps) is faster than the BDP-TTP compound (about 22 ps). Since the BODIPY core directly binds to the porphyrin unit, rapid energy transfer was seen for both compounds. Thus, the energy transfer rate increased with an increasing number of BODIPY moiety connected to free-base porphyrin.

Room-temperature white and color-tunable afterglow by manipulating multi-mode triplet emissions

2021 ◽  
Vol 9 (9) ◽  
pp. 3257-3263
Author(s):  
Jianwei Liu ◽  
Zhimin Ma ◽  
Zewei Li ◽  
Yan Liu ◽  
Xiaohua Fu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Single Component ◽  
Color Tunable ◽  
First Time ◽  
Multi Mode

Two isomers pDCzPyCN and oDCzPyCN are designed and synthesized. Amazingly, oDCzPyCN manifest white afterglow at room temperature. This is the first time that single-component white afterglow has finally been realized.

scholarly journals Energy transfer mechanisms and resolvent analysis in the cylinder wake

2021 ◽  
Vol 6 (2) ◽  
Author(s):  
Bo Jin ◽  
Sean Symon ◽  
Simon J. Illingworth
Keyword(s):  
Energy Transfer ◽  
Cylinder Wake ◽  
Transfer Mechanisms

scholarly journals Melt-Spun Photoluminescent Polymer Optical Fibers for Color-Tunable Textile Illumination

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1740
Author(s):  
Konrad Jakubowski ◽  
Manfred Heuberger ◽  
Rudolf Hufenus
Keyword(s):  
Energy Transfer ◽  
Optical Fibers ◽  
Color Space ◽  
Emission Spectra ◽  
Wide Range ◽  
Color Tunable ◽  
Melt Spun ◽  
Polymer Optical Fibers ◽  
Collective Emission ◽  
Down Conversion

The increasing interest in luminescent waveguides, applied as light concentrators, sensing elements, or decorative illuminating systems, is fostering efforts to further expand their functionality. Yarns and textiles based on a combination of distinct melt-spun polymer optical fibers (POFs), doped with individual luminescent dyes, can be beneficial for such applications since they enable easy tuning of the color of emitted light. Based on the energy transfer occurring between differently dyed filaments within a yarn or textile, the collective emission properties of such assemblies are adjustable over a wide range. The presented study demonstrates this effect using multicolor, meltspun, and photoluminescent POFs to measure their superimposed photoluminescent emission spectra. By varying the concentration of luminophores in yarn and fabric composition, the overall color of the resulting photoluminescent textiles can be tailored by the recapturing of light escaping from individual POFs. The ensuing color space is a mean to address the needs of specific applications, such as decorative elements and textile illumination by UV down-conversion.

scholarly journals Energy transfer triggered multicolor emissions in Tb3+/Eu3+-coacitivated Y2Mo3O12 negative thermal expansion micropartices for dual-channel tunable luminescent thermometer

2021 ◽  
Author(s):  
Peng Du ◽  
Laihui Luo ◽  
Yafei Hou ◽  
Weiping Li
Keyword(s):  
Thermal Expansion ◽  
Energy Transfer ◽  
Negative Thermal Expansion ◽  
Thermal Quenching ◽  
High Quality ◽  
Dual Channel ◽  
Color Tunable ◽  
Rational Control

Rational control of thermal quenching performance is crucial for achieving high quality luminescent thermometer. Herein, we report the Tb3+/Yb3+-coactivated Y2Mo3O12 (YMO) negative thermal expansion (NTE) microparticles with color-tunable emissions. Irradiated...

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