High pressure effect on charge transfer transition in Y2O2S:Eu3+

Behrendt, Mirosław; Szczodrowski, Karol; Mahlik, Sebastian

doi:10.1016/j.optmat.2013.11.013

Cited by 38 publications

(16 citation statements)

References 27 publications

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“…Because Eu 2+ is highly dependent on the environment, each material emits in a specific range [7]. Y 2 O 2 S:Eu is a well-known phosphor which has mainly been investigated as a host for Eu 3+ in order to obtain red emission [5,[16][17][18][19][20][21]. This is supported by the similar dimensions of Eu 3+ and Y 3+…”

Section: Introductionmentioning

confidence: 97%

Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

et al. 2019

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Structural and photoluminescence studies were carried out on Eu-doped Y2O3−xSx thin films grown by atomic layer deposition at 300 °C. (CH3Cp)3Y, H2O, and H2S were used as yttrium, oxygen, and sulfur precursors, respectively, while Eu(thd)3 was used as the europium precursor. The Eu oxidation state was controlled during the growth process by following the Eu(thd)3 pulse with either a H2S or O3 pulse. The Eu(thd)3/O3 pulse sequence led to photoluminescence emission above 550 nm, whereas the Eu(thd)3/H2S pulse sequence resulted in emission below 500 nm.

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Section: Introductionmentioning

confidence: 97%

Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

et al. 2019

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“…Trivalent europium doped yttrium oxysulifde Y 2 O 2 S:Eu 3+ (YOS) is a common red emitting phosphor which has been widely used in cathode ray tubes (CRTs) and field emission displays (FEDs). − With the rapid development of modern display industry, a considerable number of waste CRTs are generated every year . Statistics showed that approximately 5.96 million units of CRT computer monitors and TVs were obsoleted every year in North America and that more than 60 million accumulated in China in 2013 .…”

Section: Introductionmentioning

confidence: 99%

Green Recovery of Rare Earths from Waste Cathode Ray Tube Phosphors: Oxidative Leaching and Kinetic Aspects

Yin

Tian

et al. 2016

ACS Sustainable Chem. Eng.

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In this work, we developed a green and efficient process for the recovery of rare earths from waste cathode ray tube phosphors. The mixture of hydrochloric acid and hydrogen peroxide was identified as the most suitable leaching agent due to the synergistic effect. The effects of various parameters on leaching process were explored, and the optimal conditions with stirring speed 600 rpm, temperature 313 K, 1 M of H2O2, 4 M of HCl, and leaching time of 90 min were determined. Furthermore, a possible reaction mechanism was proposed, and the kinetics for the leaching process was investigated in detail. The leaching process was found to follow a shirking-core model, with the chemical reaction as the rate-controlling step. The apparent activation energy of the reaction was calculated as 52.3 kJ/mol, and the reaction orders for H2O2 and HCl were established as 0.82 and 2.13, respectively. The kinetic equation was established. Moreover, the optimal leaching conditions were applied to the waste phosphors, and the oxalate precipitation process was employed, achieving the recovery rate of rare earths >99.5%. After calcining, a well crystallized (Y0.95Eu0.05)2O3 product with a purity of 99% was obtained with an average diameter of 5 μm.

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“…Furthermore, the doping of red component from other light‐emitting centers, such as emission from europium (Eu 3+ ) ion is of crucial importance in the alteration of the luminescence property of the doped system to achieve simultaneous generation of the red/green/blue (RGB) emission. Meanwhile, Eu 3+ ion is a red emitting activator due to its 5 D 0 – 7 F 2 transition, and many investigations have been conducted in various hosts, such as Y 2 O 2 S: Eu 3+ , SrB6O10: Eu 3+ , CaSnO 3 : Eu 3+ , Ca 4 GdNbMo 4 O 20 : Eu 3+ , Ba 3 La(PO 4 ) 3 : Eu 3+ , etc . The codoping of Eu 3+ and Tb 3+ ions may result in either enhancement/decrement of the luminescence intensity of either of the ions or may cause changes in chromaticity coordinates for tuning the emissive color by selective excitations .…”

Section: Introductionmentioning

confidence: 99%

Tuning the Color Emission of Sr₂P₂O₇: Tb³⁺, Eu³⁺ Phosphors Based on Energy Transfer

Wang

Jia

et al. 2015

J. Am. Ceram. Soc.

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A series of color tunable Tb 3+ -and Eu 3+ -activated Sr 2 P 2 O 7 phosphors were synthesized by a traditional solid-state reaction method in air atmosphere. The crystal structure, photoluminescence (PL) properties, energy transfer, thermal stability, and luminous efficiency were investigated. A series of characteristic emission of Tb 3+ and Eu 3+ were observed in the PL spectra and the variation in the emission intensities of the three emission peaks at around 416 nm (blue), 545 nm (green), and 593 nm (orange-red) induced the multicolor emission evolution by tuning the Tb 3+ /Eu 3+ content ratio. The energy-transfer mechanism from Tb 3+ to Eu 3+ ion was determined to be dipole-dipole interaction, and the energy-transfer efficiency was about 90%. The novel phosphors have excellent thermal stability in the temperature range of 77-473 K and the Commission International De L'Eclairage 1931 chromaticity coordinates of Sr 2 P 2 O 7 : Tb 3+ , Eu 3+ (k ex = 378 nm) move toward the ideal white light coordinates.

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High pressure effect on charge transfer transition in Y2O2S:Eu3+

Cited by 38 publications

References 27 publications

Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

Green Recovery of Rare Earths from Waste Cathode Ray Tube Phosphors: Oxidative Leaching and Kinetic Aspects

Tuning the Color Emission of Sr₂P₂O₇: Tb³⁺, Eu³⁺ Phosphors Based on Energy Transfer

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High pressure effect on charge transfer transition in Y2O2S:Eu3+

Cited by 38 publications

References 27 publications

Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

Control of Eu Oxidation State in Y2O3−xSx:Eu Thin-Film Phosphors Prepared by Atomic Layer Deposition: A Structural and Photoluminescence Study

Green Recovery of Rare Earths from Waste Cathode Ray Tube Phosphors: Oxidative Leaching and Kinetic Aspects

Tuning the Color Emission of Sr2P2O7: Tb3+, Eu3+ Phosphors Based on Energy Transfer

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Tuning the Color Emission of Sr₂P₂O₇: Tb³⁺, Eu³⁺ Phosphors Based on Energy Transfer