The fluorescence self-healing mechanism and temperature-sensitive properties of a multifunctional phosphosilicate phosphor

Wang, Na; Li, Tiejun; Han, Lili; Wang, Yichao; Ci, Zhipeng; Wang, Yuhua; Jiao, Haiyan

doi:10.1007/s10853-019-03350-w

Cited by 10 publications

(6 citation statements)

References 49 publications

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“…As for the MGS host, the absorption band was found to be located between 200 and 375 nm. In a different manner, the Mn 4+ -doped samples possessed not only the host absorption but also absorption bands over the 400–600 nm range arising from the intra-d-shell electronic transitions of Mn 4+ ions . Due to the improvement of the Mn 4+ doping concentration, the absorption band intensities were obviously enhanced.…”

Section: Resultsmentioning

confidence: 98%

“…In a different manner, the Mn 4+ -doped samples possessed not only the host absorption but also absorption bands over the 400−600 nm range arising from the intra-dshell electronic transitions of Mn 4+ ions. 42 Due to the improvement of the Mn 4+ doping concentration, the absorption band intensities were obviously enhanced. It is clear that the incorporation of Mn 4+ exerted distinct effects on the absorption of the MGS host.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

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The substitution of metal sites in Mg 2 TiO 4 substrate leads to charge imbalance that will be closely related to a variety of changes including lattice structure, cell distortion, and photophysical properties. Herein, the co-substitution strategy of [Ga 3+ −Ga 3+ ] for [Mg 2+ −Ti 4+ ] and Sn 4+ for Ti 4+ achieves for the first time the novel Mg 3 Ga 2 SnO 8 (MGS):xMn 4+ (x = 0−3%) phosphors with efficient red emissions. In terms of X-ray powder diffraction (XRD) and Rietveld refinement analysis, MGS:Mn 4+ possesses a structure isotypic of Mg 2 TiO 4 in the cubic space group Fd3̅ m (227). There are two types of octahedra for Mn 4+ ions in this structure, where Ga 3+ ions completely occupy a group of octahedral sites and Mg 2+ /Sn 4+ has been randomly distributed over another group of octahedral sites. A strong excitation band in the broad spectral range (220− 550 nm) has been identified, thus facilitating the commercial uses for blue LED chips excitation. An intense red emission band at 680 nm has been observed due to the characteristic 2 E g − 4 A 2g transition of Mn 4+ ions. A concentration quenching effect occurs when the Mn 4+ content exceeds 1.5%, and the quenching mechanism is demonstrated to be dipole−quadrupole interactions. Temperature-dependent luminescence measurements support its good thermal stability, and the corresponding activation energy E a is determined to be 0.2552 eV. The possible luminous mechanism of the Mn 4+ ion is explained by the Tanabe−Sugano energy level diagram. The crystal field strength and the Racah parameters together with the nephelauxetic ratio are also determined for Mn 4+ in the MGS lattice. High color rendition warm white-lightemitting diodes (WLEDs) based on the optimal phosphor MGS:1.5%Mn 4+ ,1.5%Li + possess a color rendering index and color temperature of 85.6 and 3658 K, respectively. Its feasibility for application in solid-state white lighting has been verified.

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Section: Resultsmentioning

confidence: 98%

Section: ■ Results and Discussionmentioning

confidence: 99%

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

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“…The change in the lifetime of Eu 2+ emission upon Tb 3+ concentration was determined to study the energy transfer efficiency. [34][35][36][37][38] As disclosed in Fig. 5b, the lifetime decreases monotonously with the increasing Tb 3+ concentration.…”

Section: Resultsmentioning

confidence: 66%

Non-concentration quenching and energy transfer enhanced green emission in Ca₈SrGd(PO₄)₇:Eu²⁺,Tb³⁺ for near-UV white LEDs with a high color rendering index

Wang

Lyu

et al. 2023

J. Mater. Chem. C

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“…Sensing temperature based on luminescence materials attracts many attentions [1][2][3][4][5][6][7][8][9]. Such thermometry monitors temperature based on the change of peak shape/intensity/shift, fluorescence lifetimes, and luminescence intensity ratio (FIR) of certain phosphors against temperature, and has the advantages of high sensitivity, remote observation, and good spatial resolution [10].…”

Section: Introductionmentioning

confidence: 99%

Coprecipitation synthesis of α-(La,Yb,Er)₂W₂O₉ tungstate as a novel upconversion phosphor for optical thermometry

Wang

Feng

Gong

et al. 2021

Journal of Asian Ceramic Societies

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Phase-pure α-(La,Yb,Er) 2 W 2 O 9 upconversion (UC) phosphors were synthesized via room temperature coprecipitation and subsequent calcination at 1073-1273 K. The pH of the coprecipitation system and the RE 3+ to WO 4 2ratio were found crucial for the formation of the target α phase. Phase transformation from cubic β-(La,Yb,Er) 2 W 2 O 9 to triclinic α-(La,Yb,Er) 2 W 2 O 9 occurred when calcination temperature was above 873 K. The UC luminescence including power/temperature dependent emission, decay kinetics of the main emission, emission color, and underlying UC mechanism were systematically investigated. The phosphor exhibited bright green luminescence under 978 nm laser excitation. The main emission ( 4 S 3/2 → 4 I 15/2 ) was analyzed to decay in a single exponential manner and have a decay time of 153.86 μs at room temperature. A three-photon mechanism was suggested responsible for the observed UC luminescence through analyzing the UC intensity against excitation power via logarithmic data transformation. The performance of optical temperature sensing was evaluated and compared with other typical UC phosphors. It was shown that the phosphor has relatively high maximum S A and S R values of 0.02694 K −1 (548 K) and 0.01699 K −1 (298 K) for the thermally coupled 2 H 11/2 and 4 S 3/2 energy levels in the 298-548 K temperature range.

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The fluorescence self-healing mechanism and temperature-sensitive properties of a multifunctional phosphosilicate phosphor

Cited by 10 publications

References 49 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

Non-concentration quenching and energy transfer enhanced green emission in Ca₈SrGd(PO₄)₇:Eu²⁺,Tb³⁺ for near-UV white LEDs with a high color rendering index

Coprecipitation synthesis of α-(La,Yb,Er)₂W₂O₉ tungstate as a novel upconversion phosphor for optical thermometry

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The fluorescence self-healing mechanism and temperature-sensitive properties of a multifunctional phosphosilicate phosphor

Cited by 10 publications

References 49 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

Non-concentration quenching and energy transfer enhanced green emission in Ca8SrGd(PO4)7:Eu2+,Tb3+ for near-UV white LEDs with a high color rendering index

Coprecipitation synthesis of α-(La,Yb,Er)2W2O9 tungstate as a novel upconversion phosphor for optical thermometry

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Product

Resources

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Non-concentration quenching and energy transfer enhanced green emission in Ca₈SrGd(PO₄)₇:Eu²⁺,Tb³⁺ for near-UV white LEDs with a high color rendering index

Coprecipitation synthesis of α-(La,Yb,Er)₂W₂O₉ tungstate as a novel upconversion phosphor for optical thermometry