scholarly journals Luminescence Quenching Behavior of Hydrothermally Grown YVO4:Eu3+ Nanophosphor Excited under Low Temperature and Vacuum Ultra Violet Discharge

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3270
Author(s):  
Mihye Wu ◽  
Hyemin Park ◽  
Eun Gyu Lee ◽  
Sanghun Lee ◽  
Yu Jin Hong ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Low Temperature ◽  
Energy Transfer Process ◽  
Ultra Violet ◽  
Luminescence Quenching ◽  
Hydroxyl Groups ◽  
Hydrothermal Processing ◽  
Luminescence Efficiency ◽  
Post Annealing ◽  
Vacuum Ultra Violet

The luminescence quenching behavior and energy transfer process in hydrothermally grown Eu3+-doped YVO4 nanophosphors were studied using low temperature photoluminescence spectroscopy. The luminescence efficiency of nanophosphor is dependent on the acidity of its solution media and the post annealing condition after hydrothermal processing. The overall results suggest that the abnormal luminescence behavior of Eu3+-doped nanocrystalline YVO4 under low temperature photoexcitation is due to the incorporated non-radiative hydroxyl groups often encountered in hydrothermal synthesis as well as to the inefficient energy transfer to luminescent ions from vanadate groups.

Cooperative Energy Transfer of Er-Gd-Tb System in Tb3+, Er3+ Co-Doped K2GdZr(PO4)3 as a Potential Visible Quantum Cutting Phosphor

2014 ◽  
Vol 936 ◽  
pp. 585-590 ◽  
Author(s):  
Liang Feng Niu ◽  
Wei Liang ◽  
Chang Zeng Wu ◽  
Yu Hua Wang
Keyword(s):  
Energy Transfer ◽  
Ultra Violet ◽  
Solid State Reaction Method ◽  
Practical Application ◽  
Energy Transfers ◽  
Quantum Cutting ◽  
Down Conversion ◽  
Vacuum Ultra Violet ◽  
Co Doped ◽  
Cooperative Energy

Tb3+, Er3+co-doped K2GdZr (PO4)3samples were prepared by solid-state reaction method and their photoluminescence (PL) properties were investigated in ultra-violet (UV) and vacuum ultra-violet (VUV) region. The results indicate that the energy transfers from Er3+to Gd3+and from Gd3+to Tb3+required for occurring of visible quantum cutting through down-conversion are efficient. In this cooperative energy transfer process, Gd3+is used as an intermediate of energy transfer between Er3+and Tb3+. The optimal quantum efficiency (QE) of this co-doped system K2GdZr (PO4)3: Er3+, Tb3+phosphor reached to 110%, suggesting a potential visible quantum cutting phosphor in practical application.

scholarly journals Luminescence quenching of Sm3+ ions in alkali borotellurite glasses

2016 ◽  
Vol 26 (2) ◽  
pp. 193
Author(s):  
Vu Phi Tuyen ◽  
Phan Van Do
Keyword(s):  
Energy Transfer ◽  
Transfer Process ◽  
Luminescence Intensity ◽  
Energy Transfer Process ◽  
Interaction Mechanism ◽  
Cross Relaxation ◽  
Luminescence Quenching ◽  
Quenching Of Luminescence

The dependence of luminescence intensity on  Sm\(^{3 + }\) ions concentration in alkali borotellurite (ABTe) glasses has  been studied. The quenching of luminescence intensity happens  around 0.75 mol% concentration of Sm\(^{3 + }\) ions and it can relate the  energy transfer process through cross--relaxation (CR), the CR channels in  ABTe: Sm\(^{3 + }\) have been shown. The method of Van Uitert was used to find  the dominant interaction mechanism for energy transfer process. 

scholarly journals Ceramic Materials (Phosphors) for Display Applications

2010 ◽  
Vol 13 (1-2) ◽  
pp. 1
Author(s):  
K.V.R. Murthy ◽  
Ch. Atchyutha Rao ◽  
K. Suresh ◽  
N.V. Poornachandra Rao ◽  
B. Subba Rao ◽  
...  
Keyword(s):  
Contrast Ratio ◽  
Ultra Violet ◽  
Ceramic Materials ◽  
High Energy ◽  
High Definition ◽  
Luminescence Efficiency ◽  
Cathode Ray Tube ◽  
Plasma Display ◽  
Luminescence Characteristics ◽  
Vacuum Ultra Violet

<p>Phosphors the ceramic materials should able to work in tough environment surrounded and bombarded by high energy Vacuum Ultra Violet (VUV), UV or electron beam radiations in any discharge tube. The plasma display panel (PDP) is increasingly gaining attention over conventional cathode ray tube (CRT)- based TVs as a medium of large format (60+”) television (TV), particularly high definition TVs (HDTVs). Improvements have been made not only in size but also in other areas such as resolution, luminescence efficiency, brightness, contrast ratio, power consumption, and cost reduction. The formation of a phosphor host and doping process by solid solution is critical and is highly dependent on the reaction temperature and conditions. Since the purity of starting chemicals is very important to the synthesis of phosphors, the starting chemicals are typically 99.9%, 99.999% in purity. Required amounts of starting ingredients are mixed in the presence of an appropriate flux (if necessary) and fired at high temperatures (1200 °C) in air or in a controlled atmosphere (N<sub>2</sub>, C, CO, or N<sub>2</sub> with 2-5% of H<sub>2</sub>). The present paper reports the synthesis and luminescence characteristics of different ceramic materials (phosphors) for display applications.</p>

Synthesis and Fluorescence Properties of a Terbium Complex with Ferrocenylazobenzoic Acid in Nanoparticles

2017 ◽  
Vol 898 ◽  
pp. 1850-1856 ◽  
Author(s):  
Yu Guang Lv ◽  
Bo Wang ◽  
Yu Shan Qin ◽  
Xiao Li Qi ◽  
Shan Shan Song ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Energy Transfer Process ◽  
Uv Spectroscopy ◽  
Green Emission ◽  
Terbium Complex ◽  
Efficient Energy Transfer ◽  
Luminescence Efficiency ◽  
Pyridinedicarboxylic Acid ◽  
Electroluminescence Device ◽  
Terbium Complexes

Tb (AUFA)32H2O, a rare earth terbium complex,was synthesized by introducing 4-(11-azobenzene-undecyloxy) ferrocene acid (AUFA) as the ligand. This complex was characterized by elemental analysis, MS, IR, Raman, UV spectroscopy and fluorescence spectrophotometry. The complex exhibited ligand-sensitized green emission, and Tb (AUFA)32H2O had a higher sensitized luminescence efficiency and a longer lifetime than the other terbium complexes (DPC: 2, 6-Pyridinedicarboxylic acid, Aspirin: 2-ethanoylhydroxybenzoic acid). The organic-inorganic thin film of complexe Tb (AUFA)32H2O in nanoTiO2 was fabricated, and the nanoTiO2 has been used in the luminescence layer to change the luminescence property of complexes Tb (AUFA)32H2O. It was found that there was an efficient energy transfer process between the ligands and metal ions. Moreover, In an ITO/PVK/Tb (AUFA)32H2O/Al device, Tb3+ may be excited by intramolecular energy transfer from the ligand, as observed by electroluminescence. The main emitting peak at 545 nm can be attributed to the 5D4→7F5 transition of the Tb3+ ion, and this process results in the enhancement of the green emission from the electroluminescence device.

Heat, quantum mechanics and information

2015 ◽  
Vol 10 (2) ◽  
pp. 2692-2695
Author(s):  
Bhekuzulu Khumalo
Keyword(s):  
Information Theory ◽  
Quantum Mechanics ◽  
Energy Transfer ◽  
Transfer Process ◽  
Energy Transfer Process ◽  
Process Information ◽  
Double Slit Experiment ◽  
Slit Experiment ◽  
Double Slit

Heat has often been described as part of the energy transfer process. Information theory says everything is information. If everything is information then what type of information is heat, this question can be settled by the double slit experiment, but we must know what we are looking for. 

Origin of the Red Sites and Energy Transfer Rates in Single MEH-PPV Chains at Low Temperature

ChemPhysChem ◽  
2011 ◽  
Vol 12 (8) ◽  
pp. 1499-1508 ◽  
Author(s):  
Florian A. Feist ◽  
Martin F. Zickler ◽  
Thomas Basché
Keyword(s):  
Energy Transfer ◽  
Low Temperature ◽  
Transfer Rates

scholarly journals Contribution of resonance energy transfer to the luminescence quenching of upconversion nanoparticles with graphene oxide

2020 ◽  
Vol 575 ◽  
pp. 119-129 ◽  
Author(s):  
Diego Mendez-Gonzalez ◽  
Oscar G. Calderón ◽  
Sonia Melle ◽  
Jesús González-Izquierdo ◽  
Luis Bañares ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Luminescence Quenching ◽  
Upconversion Nanoparticles
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