Abnormal thermal quenching and application for w-LEDs: Double perovskite Ca2InSbO6:Eu3+ red-emitting phosphor

Geng, Xue; Xie, Yue; Ma, Yingying; Liu, Yuanyuan; Luo, Junmeng; Wang, Jianxu; Yu, Ruijin; Deng, Bin; Zhou, Wenming

doi:10.1016/j.jallcom.2020.156249

Cited by 83 publications

(19 citation statements)

References 53 publications

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“…78 According to previous reports, the major reason for this phenomenon is supposed to be the compensation effect of the electrons thermally released from the defect energy levels. 79,80 Along with the heating process, the trapped electrons could be transferred back to the excited orbitals; meanwhile, the possibility of the thermally stimulated transition rises, resulting in an increase in the emission intensity. Therefore, the above process could compensate for the emission loss because of the increasing probability of a nonradiative transition and even enhance the emission intensity.…”

Section: Vuv-excited Plmentioning

confidence: 99%

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn₂(P₂O₇)₂

et al. 2021

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Single-phase white-emission phosphors possess a judicious usage potential in phosphor-converted white-light-emitting diodes (WLEDs). Recently, numerous efforts have been made toward the development of new patterns of white-emitting phosphors that achieve excellent quantum yield, superior thermal stability, and applaudable cost effectiveness of WLEDs. Finding suitable single-component white phosphor hosts to provide an ideal local environment for activators remains urgent. Inspired by the original discovery of the promising host MgIn 2 (P 2 O 7 ) 2 (MIP) and its structural dependence on alkali-metal cations, we synthesized a brand-new phosphor host, SrIn 2 (P 2 O 7 ) 2 (SIP), via the traditional solid-state reaction. Its crystal structure was determined using an ab initio analysis and the Rietveld method. It belongs to a monoclinic unit cell with the space group C2/c. Besides, SIP exhibits a special layered three-dimensional framework in which the monolayer [SrO 10 ] ∞ was surrounded by a bilayer [In 2 P 4 O 14 ] ∞ made of the InO 6 octahedra and P 2 O 7 groups. A series of pure SIP:Tm 3+ ,Dy 3+ phosphors with tunable blue−white−yellow emission were prepared by adjusting the dopant concentration and utilizing the Tm 3+ −Dy 3+ energy transfer. The daylight-white-emitting phosphor SIP:0.01Tm 3+ ,0.04Dy 3+ (the correlated color temperature is 4448 K) exhibits an abnormal thermal antiquenching property, and the emission intensity of 423 K reaches 103.7% of the initial value at 300 K. On the basis of the temperature-dependent lattice evolution and microenvironment analysis, the reduction of β and lattice distortion can lead to lower asymmetry of the activators and benefit the compensation of trapped-electron thermal activation. In this work, an integration study was carried out on the crystal structure of the new matrix, the occupation of the luminescent center, the interaction of different activators in the host, and the distortion degree of the local structure for the activators, which is of great practical sense for producing a novel single-matrix white phosphor possessing superior thermal endurance for UV-light-stimulated WLEDs.

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Section: Vuv-excited Plmentioning

confidence: 99%

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn₂(P₂O₇)₂

et al. 2021

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“…In regard to the performance of Eu 3+ -activated phosphors, the following aspects should be taken into account: concentration quenching, quantum efficiency (QE), thermal stability, and color purity. Generally, the distances of the nearest-neighbor site play the key role in the concentration quenching and quantum efficiency, while, except for structural rigidity, the thermal activation compensation effect of lattice defects has been recognized to contribute zero-temperature-quenching characteristics . As a widely accepted view, the local symmetry of Eu 3+ decides the transition rate of 5 D 0 → 7 F 1 or 5 D 0 → 7 F 2 and thus induces the special color of emission. , Therefore, the local structural tune of Eu 3+ for adjusting its luminescence properties has important practical significance.…”

Section: Introductionmentioning

confidence: 99%

Dependence of Luminous Performance on Eu³⁺ Site Occupation in SrIn₂(P₂O₇)₂: The Effect of the Local Environment

Liu

Wang

et al. 2021

Inorg. Chem.

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The photoluminescence behavior of luminescent materials with rare earth (RE) ions as a luminescence center not only depends on the element type and chemical valence of RE ions but also on their concentration and occupation in the matrix, sometimes including the interaction of the matrix and RE ions or between different RE ions. Herein, special SrIn2(P2O7)2 phosphate, assembled by monolayer [SrO10]∞ and bilayer [In2P4O14]∞ consisting of InO6 units and P2O7 groups, was selected as the host material, and different cation positions (Sr and In) were substituted by Eu3+. The structure refinement in combination with Judd–Ofelt theory has shed light on the differences of the Eu3+ coordination environment in SrIn2(P2O7)2. The structural rigidity of the In3+ site is better than that of the Sr2+ site, making SrIn1.92(P2O7)2: Eu0.08 superior in thermal stability. The average distance between adjacent Sr2+ ions is larger than that between adjacent In3+ ions, causing the higher quantum efficiency of Sr0.9In2(P2O7)2: Eu0.1. The present work demonstrates that the site occupation of Eu3+ has an important effect on its luminous performance. Importantly, the newly developed Eu3+-doped SrIn2(P2O7)2 phosphors, exhibiting outstanding luminous efficiency, favorable thermal stability, and excellent color purity, are promising red components of phosphor-based light-emitting diodes.

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“…This result showed that the decay time declined from 1.071 to 0.919 ms as the Eu 3+ concentrations ascend which demonstrated by the nonradioactive energy transfer among Eu 3+ . 42 The quantum efficiency (QE) of the Sr 2 InTaO 6 :0.12Eu 3+ sample measured at room temperature under excitation at 394 nm was presented in Fig. S3 (ESI), † and the enlarged profile of the PL spectrum shown in the inset.…”

Section: Resultsmentioning

confidence: 99%

Structure and photoluminescence of Eu³⁺ doped Sr₂InTaO₆ red phosphor with high color purity

Zhao

Gao

et al. 2021

RSC Adv.

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Abnormal thermal quenching and application for w-LEDs: Double perovskite Ca2InSbO6:Eu3+ red-emitting phosphor

Cited by 83 publications

References 53 publications

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn₂(P₂O₇)₂

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn₂(P₂O₇)₂

Dependence of Luminous Performance on Eu³⁺ Site Occupation in SrIn₂(P₂O₇)₂: The Effect of the Local Environment

Structure and photoluminescence of Eu³⁺ doped Sr₂InTaO₆ red phosphor with high color purity

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Abnormal thermal quenching and application for w-LEDs: Double perovskite Ca2InSbO6:Eu3+ red-emitting phosphor

Cited by 83 publications

References 53 publications

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn2(P2O7)2

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn2(P2O7)2

Dependence of Luminous Performance on Eu3+ Site Occupation in SrIn2(P2O7)2: The Effect of the Local Environment

Structure and photoluminescence of Eu3+ doped Sr2InTaO6 red phosphor with high color purity

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Product

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Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn₂(P₂O₇)₂

Daylight-White-Emitting and Abnormal Thermal Antiquenching Phosphors Based on a Layered Host SrIn₂(P₂O₇)₂

Dependence of Luminous Performance on Eu³⁺ Site Occupation in SrIn₂(P₂O₇)₂: The Effect of the Local Environment

Structure and photoluminescence of Eu³⁺ doped Sr₂InTaO₆ red phosphor with high color purity