Photoluminescence enhancement of Ca3Sr3(VO4)4:Eu3+,Al3+ red-emitting phosphors by charge compensation

Wu, Yangting; Chen, Min; Qiu, Kehui; Zhang, Wentao; Tang, Qingfeng

doi:10.1016/j.optlastec.2019.04.032

Cited by 15 publications

(3 citation statements)

References 48 publications

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“…The CIE chromaticity coordinate of the green and red QDs/micro-LEDs with HBR, DBR, and blue light absorption layer was (0.292, 0.632) and (0.646, 0.279), respectively. The color purity of the LEDs could be estimated by Equation (1) as follows [15][16][17]:…”

Section: Resultsmentioning

confidence: 99%

Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

et al. 2020

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In this study, CdSe/ZnS core-shell quantum dots (QDs) with various dimensions were used as the color conversion materials. QDs with dimensions of 3 nm and 5 nm were excited by gallium nitride (GaN)-based blue micro-light-emitting diodes (micro-LEDs) with a size of 30 μm × 30 μm to respectively form the green and red lights. The hybrid Bragg reflector (HBR) with high reflectivity at the regions of the blue, green, and red lights was fabricated on the bottom side of the micro-LEDs to reflect the downward light. This could enhance the intensity of the green and red lights for the green and red QDs/micro-LEDs to 11% and 10%. The distributed Bragg reflector (DBR) was fabricated on the QDs color conversion layers to reflect the non-absorbed blue light that was not absorbed by the QDs, which could increase the probability of the QDs excited by the reflected blue light. The blue light absorption material was deposited on the DBR to absorb the blue light that escaped from the DBR, which could enhance the color purity of the resulting green and red QDs/micro-LEDs to 90.9% and 90.3%, respectively.

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Section: Resultsmentioning

confidence: 99%

Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

et al. 2020

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“…Here, a variety of color-tunable Sm 3+ doped CaMoO 4 phosphors were synthesized using a high temperature solid state technique [23][24][25][26][27] . Alkali metal ions (M + = Li, Na, K) were added to the phosphors as a charge compensation agent to reduce the structural defect of the phosphors and adjust the luminous intensity.…”

Section: Introductionmentioning

confidence: 99%

Charge compensation improves energy transfer to realize anti-thermal-quenching and improve the CaMoO4: Sm3+ phosphors optical temperature measurement sensitivity base on the FIR model

Zhu,

Wu,

et al. 2024

Preprint

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Luminescent materials are the main focus of non-contact thermometers due to their high detection sensitivity, non-invasiveness, quick reaction, exceptional stability. It is still difficult to design high sensitivity optical temperature sensors using FIR technology. This article increases FIR value and obtains high sensitivity temperature sensitive phosphors by utilizing the anti-thermal-quenching effect of rare earth luminous centers. Sm3+ and alkali metal co-doped CaMoO4 phosphors have been prepared by high-temperature solid-state method. Rietveld XRD refinement results showed that the co-doping of Sm3+ and K+ can significantly improve the energy transfer from the host to Sm3+ and significantly increase the luminous intensity of Sm3+. We found that co-doping of Sm3+ and K+ not only effectively enhanced the luminescence intensity, but also regulated the lifetime of this phosphors. As the Sm3+ and K+ co-doping concentration 0.02, respectively, the τ value decreases from 4.12 to 3.54 ms, which proves to be effective in luminous of LED. The optical temperature measurement of CaMoO4: 0.001Sm3+, 0.001K+ was studied using FIR technology. The maximum SaMAX and SrMAX values are 0.27 K-1 at 483 K and 2.25% K-1 at 363 K, respectively. Moreover, the CaMoO4: 0.02Sm3+, 0.02K+ also has a certain absorption capacity in visible optical drive, which proved by UV-Vis DRS. The electronic density of states of phosphors are drawn via first-principles to understand the effect of Sm3+ and alkali metals co-doped on luminescence. The above results demonstrate that the Sm3+ and K+ co-doping CaMoO4 might be an attractive material for the application of temperature measurement and light-emitting diode.

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“…Vanadates are a group of the most important inorganic oxysalts with lower resultant temperature and the vanadate-based phosphors have been drawn more attention in the last 10 years, including such downconversion phosphors as La 7 O 6 (VO 4 ) 3 :RE 3+ (RE = Eu, Sm), Ca 3 Sr 3 (VO 4 ) 4 :Eu 3+ ,Al 3+ , and Ba 3 La(VO 4 ) 3 :Eu 3+ and upconversion phosphors YVO 4 : Yb 3+ , Er 3+ , K 3 Y(VO 4 ) 2 :Yb 3+ /Ln 3+ (Ln = Ho, Er, Tm), and Ca 5 Mg 4 (VO 4 ) 6 :Yb 3+ , Er 3+ . β-K 2 SO 4 is characterized by a very flexible structure, in which K can be substituted by other alkali metal atoms and the SO 4 group could be submitted by PO 4 to form various compounds. − In our previous studies, β-K 2 SO 4 -type phosphate Na 3 La(PO 4 ) 2 was synthesized and single-crystal X-ray diffraction (SC-XRD) determination reveals that it crystallizes in the modulated structure with the super space group Pca 2 1 (0β0)000 .…”

Section: Introductionmentioning

confidence: 99%

(3+1)-Dimensional Modulated Structure and Tb³⁺-Doped Luminescence for Vanadate Na₃La(VO₄)₂

Zhao

et al. 2022

Inorg. Chem.

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A modulated structure with symmetrical characteristic higher than three-dimensional is a fascinating crystallographic type, and it is randomly encountered by researchers. Herein, we prepared 0.1 mm level single crystals of Na 3 La(VO 4 ) 2 and determined its structure to be a (3 + 1)-dimensional modulated structure using the X-ray diffraction analysis method for single crystals. Its super space group was determined to be Pca2 1 (0β0)-000. On the other hand, we introduced Tb 3+ into the Na 3 La(VO 4 ) 2 host lattice to fabricate phosphors Na 3 La 1-x (VO 4 ) 2 :xTb 3+ and studied their photoluminescence properties. Interestingly, for the strong absorption of the Na 3 La(VO 4 ) 2 host lattice in the range of 200−400 nm, the traditional 330−385 nm light is unable to efficiently excite Tb 3+ ions in the Na 3 La(VO 4 ) 2 host to generate luminescence of Tb 3+ . Instead, Na 3 La 1−x (VO 4 ) 2 :xTb 3+ is suitable to be excited by 487 nm to generate emitting light at 543, 584, and 622 nm, due to Tb 3+ characteristic 4f → 4f transitions of 5 D 4 → 7 F J (J = 5, 4, 3). Hence, the Tb 3+ -doped Na 3 La(VO 4 ) 2 phosphors have potential applications for white-light-emitting diodes.

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Photoluminescence enhancement of Ca3Sr3(VO4)4:Eu3+,Al3+ red-emitting phosphors by charge compensation

Cited by 15 publications

References 48 publications

Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

Charge compensation improves energy transfer to realize anti-thermal-quenching and improve the CaMoO4: Sm3+ phosphors optical temperature measurement sensitivity base on the FIR model

(3+1)-Dimensional Modulated Structure and Tb³⁺-Doped Luminescence for Vanadate Na₃La(VO₄)₂

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Photoluminescence enhancement of Ca3Sr3(VO4)4:Eu3+,Al3+ red-emitting phosphors by charge compensation

Cited by 15 publications

References 48 publications

Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

Improved Color Purity of Monolithic Full Color Micro-LEDs Using Distributed Bragg Reflector and Blue Light Absorption Material

Charge compensation improves energy transfer to realize anti-thermal-quenching and improve the CaMoO4: Sm3+ phosphors optical temperature measurement sensitivity base on the FIR model

(3+1)-Dimensional Modulated Structure and Tb3+-Doped Luminescence for Vanadate Na3La(VO4)2

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(3+1)-Dimensional Modulated Structure and Tb³⁺-Doped Luminescence for Vanadate Na₃La(VO₄)₂