Fast synthesis and energy transfer of the tunable single-phase white-emitting phosphor Li2Gd4(WO4)7:Dy3+, Tm3+ for WLEDs

Fan, Minghan; Liu, Shuo; Yang, Kai; Guo, Jia; Wang, Junxian; Wang, Xuhong; Liu, Quan; Wei, Bo

doi:10.1016/j.ceramint.2019.11.189

Cited by 19 publications

(4 citation statements)

References 39 publications

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“…In recent years, one of the major scientific interests in the field of lighting and display is the development of phosphor-converted white-light-emitting diodes (WLEDs). They have been extensively applied in daily life owing to their advantages including high light efficiency, low power consumption, and long service life. − Currently, by integration of blue InGaN chips with yellow YAG:Ce 3+ phosphors, the most common approach to achieving commercial WLEDs can be realized. , However, the shortage of a red-emission contribution results in an unsatisfactory color rendering index (CRI) and exorbitant correlated color temperature (CCT). , The most direct way to overcome the above shortcomings is enrolling a red component in the [InGaN chip + YAG:Ce 3+ ] system, , such as the Mn 4+ -doped fluoride red phosphor A 2 XF 6 :Mn 4+ (A = K, Na, Cs, NH 4 ; X = Si, Ge, Sn, Ti) systems . However, without green components, it is hard to further improve the CRI .…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…These excitation peaks are due to the occurrence of Dy 3+ outer electron 4f–4f energy level transition, corresponding to Dy 3+ ion 4f electrons from the 6 H 15/2 ground state to the excited state 6 P 3/2 , 6 P 7/2 , 6 P 5/2 , 4 F 7/2 , 4 G 11/2 , 4 I 15/2 and 4 F 9/2 transitions, respectively. 29 Since the excitation peak at 388 nm is the highest, the PL spectra upon 388 nm excitation are performed. Under the excitation wavelength of 388 nm, three characteristic emission peaks appear at 487 nm, 574 nm and 666 nm, which correspond to the three energy transitions of Dy 3+ : 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 11/2 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The excitation spectrum of the Dy 3+ doped LBGW phosphor was detected at a wavelength of 574 nm. It can be seen that there are multiple excitation peaks between 4 G 11/2 , 4 I 15/2 and 4 F 9/2 transitions, respectively 29. Since the excitation peak at 388 nm is the highest, the PL spectra upon 388 nm excitation are performed.…”

mentioning

confidence: 99%

Layer-structure-suppressed concentration quenching of Dy³⁺ luminescence and the realization of a single phase white light-emitting phosphor cooperated with Tm³⁺

Xie

et al. 2022

Inorg. Chem. Front.

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“…One of the RE ions Dy 3+ has a great potential in the preparation of white phosphors because of the emission light of Dy 3+ contain blue (470-500 nm) and yellow (570-600 nm) composition under UV excitation [20]. Thulium Tm 3+ can be used as a sensitizer to promote the emission of Dy 3+ ions due to the energy transfer between Tm 3+ and Dy 3+ [21]. Europium Eu 3+ ions are wide used in phosphors due to the red emission upon UV excitation [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

Bi¹,

Jia²,

Liu³

et al. 2022

Journal of Renewable Materials

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A series of uniform single-phase spherical BaWO 4 : Dy 3+ , Tm 3+ , Eu 3+ phosphors were prepared via a microwave hydrothermal method by using trisodium citrate dehydrate as surfactant. The phase structure, morphology and photoluminescence properties were measured by powder X-ray diffraction, scanning electron microscope and fluorescence spectrometer, respectively. The results show that uniform spherical microcrystals with diameters in the range of 2-4 μm are obtained. And the phase and morphology of samples are not significantly changed by doping rare earth (RE 3+ ) ions. Under the excitation wavelength of 356 and 365 nm, the samples BaWO 4 : 0.03Dy 3+ , yTm 3+ can emit cold white light. In order to lower the correlated color temperature (CCT) to get a warm white light, the Eu 3+ ions were doped into BaWO 4 : 0.03Dy 3+ , 0.01Tm 3+ . Especially, under the excitation of 365 nm, BaWO 4 : 0.03Dy 3+ , 0.01Tm 3+ , 0.03Eu 3+ phosphor shew a bright warm white light with color coordinate of (0.4013, 0.3629) and CCT of 3288 K. Moreover, in the BaWO 4 : Dy 3+ , Tm 3+ , Eu 3+ phosphors, the energy transfer mechanism among Dy 3+ , Tm 3+ and Eu 3+ ions have been discussed and the change of electron structures have been calculated by first-principles calculations. The results shew that the uniform single-phase spherical BaWO 4 : Dy 3+ , Tm 3+ , Eu 3+ phosphors could be favorable candidates in warm white LEDs.

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Fast synthesis and energy transfer of the tunable single-phase white-emitting phosphor Li2Gd4(WO4)7:Dy3+, Tm3+ for WLEDs

Cited by 19 publications

References 39 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

Layer-structure-suppressed concentration quenching of Dy³⁺ luminescence and the realization of a single phase white light-emitting phosphor cooperated with Tm³⁺

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

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Fast synthesis and energy transfer of the tunable single-phase white-emitting phosphor Li2Gd4(WO4)7:Dy3+, Tm3+ for WLEDs

Cited by 19 publications

References 39 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

Layer-structure-suppressed concentration quenching of Dy3+ luminescence and the realization of a single phase white light-emitting phosphor cooperated with Tm3+

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

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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

Layer-structure-suppressed concentration quenching of Dy³⁺ luminescence and the realization of a single phase white light-emitting phosphor cooperated with Tm³⁺