Tunable luminescence and improved thermostability via Tm―Dy energy transfer in a tellurooxyphosphate phosphor

Song, Ruitong; Li, Hong; Zhang, Hongzhi; Tang, Huan; Tang, Xiangkai; Yang, Jun; Zhao, Heyun; Zhu, Jing

doi:10.1016/j.apmt.2022.101712

Cited by 5 publications

(2 citation statements)

References 69 publications

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“…Ce:YAG PCs are considered to be the potential conversion materials. Nevertheless, white LED/LDs structured by traditional Ce:YAG PCs still suffer from a low color rendering index (CRI＜60) and highly correlated color temperature (CCT＞7500 K) due to the lack of spectral components both in red and cyan areas [1,[14][15][16][17][18][19]. Many optimized PCs usually have the problem of luminous declining under high power density excitation.…”

Section: Introductionmentioning

confidence: 99%

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High recorded color rendering performance of single-structured Ce,Mn:Y ₃(Al,Sc) ₂Al ₃O ₁₂ phosphor ceramics for high-power white LEDs/LDs

Liu,

Yang,

et al. 2024

Journal of Advanced Ceramics

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Achieving high color rendering index (CRI) and luminous stability in single-structured Ce:YAG phosphor ceramics (PCs) is crucial for high-power white light-emitting diodes or laser diodes (LEDs/LDs). However, cyan valley and insufficient red component of the Ce:YAG emission spectra significantly limit their real applications. In this work, a series of Ce,Mn:Y3(Al,Sc)2Al3O12 (Ce,Mn:YSAG) PCs J u s t A c c e p t e dwere fabricated by the vacuum sintering, and an efficient spectral regulation was realized for full-color lighting. The cyan valley was filled by blue-shifted emission peak of Ce 3+ via Sc 3+ doping. The orange-red emission around 580 nm was effectively supplemented via Mn 2+ doping. Particularly, the CRI of Ce,Mn:YSAG increased from 56.4 to 85.8 with a 52% increment compared with Ce:YAG under high-power LED excitation, and the operating temperature was stable at about 50 ℃ under long working time. Meanwhile, the CRI values of 80.9 could still be obtained in PC based white LDs.These results indicated that Ce,Mn:YSAG PC with excellent CRI and luminous stability is an extremely promising color convertor for high-power white LEDs/LDs.

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Section: Introductionmentioning

confidence: 99%

“…Especially, for the sample of Sc40Ce04Mn08, the CRI was attained 80.9 by the white LD device. However, due to the influence of Mn 2+ ion doping, the obtained "light to light" conversion efficiency was 67 19. lm/W, and the detailed variation trend of luminous flux as a function of laser power density are plotted in Fig.…”

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confidence: 99%

High recorded color rendering performance of single-structured Ce,Mn:Y ₃(Al,Sc) ₂Al ₃O ₁₂ phosphor ceramics for high-power white LEDs/LDs

Liu,

Yang,

et al. 2024

Journal of Advanced Ceramics

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Lattice occupation and luminous properties of the K3YSi2O7:Tm3+,Dy3+ phosphor for NUV-excited white LEDs

Liang,

Song,

et al. 2024

Appl. Phys. A

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Evaluation of the Structural, Near-Infrared Luminescence, and Radioluminescence Properties of Nd3+ Activated TTB-Lead Metatantalate Phosphors

İlhan

Keski̇n

2023

Journal of the Turkish Chemical Society Section A: Chemistry

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The study reports the structural and spectroscopic properties of Nd3+ doped lead metatantalate phosphor series fabricated by conventional solid state method. XRD results of the PbTa2O6 phase confirm the tungsten bronze symmetry and single-phase structure between 0.5 and 10 mol% Nd3+ concentrations. The lead decrease in the structure can be associated with maintaining the charge balance and single phase due to evaporation during sintering. In SEM micrographs, the grains exhibited shapeless morphology, and the grain sizes varied from 0.5 to 7 m. In EDS results, the increase of Ta/Pb ratio in grain surfaces indicated some lead evaporation, as reported in previous studies. The absorption spectrum of PbTa2O6 host peaked around 275-280 nm, and the band gap was found to be 3.7±0.2 eV. The absorptions of Nd3+ doped phophors shifted the high wavelenght or the low band gap, where the band gaps were found between 3.1±0.2 and 3.3±0.2 eV. The PL emissions of the phosphors in near-inrared region were observed with the transitions of 4F3/2→4I9/2 (at 875 nm) and 4F3/2→4I11/2 (at 1060 nm) of Nd3+. The RL emissions or X-ray excited luminescence were monitored with the transitions of 4F3/2→4I9/2 (at 875 nm), 4F3/2→4I11/2 (at 1065 nm) in the infrared region, and the transitions of 2F(2)5/2→4F9/2, 2F(2)5/2→2H(2)11/2, 2F(2)5/2→4G5/2, 2F(2)5/2→4G7/2, 2F(2)5/2→4G9/2 in the visible region corresponding to at around 430, 455, 490, 525, and 570 nm, respectively. PL and RL emissions of the phosphors exhibited the decreasing emission intensity over 5 mol% due to the concentration quenching which may be associated with cross-relaxing mechanism. In the PL and RL spectral profiles, the similarity of splitting levels was attributed to the similarity of the local symmetry of the ligand ions surrounding the Nd3+ ion. The CIE coordinates obtained using RL emissions were found close to the blue region due to visible region transitions.

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Tunable luminescence and improved thermostability via Tm―Dy energy transfer in a tellurooxyphosphate phosphor

Cited by 5 publications

References 69 publications

High recorded color rendering performance of single-structured Ce,Mn:Y ₃(Al,Sc) ₂Al ₃O ₁₂ phosphor ceramics for high-power white LEDs/LDs

High recorded color rendering performance of single-structured Ce,Mn:Y ₃(Al,Sc) ₂Al ₃O ₁₂ phosphor ceramics for high-power white LEDs/LDs

Lattice occupation and luminous properties of the K3YSi2O7:Tm3+,Dy3+ phosphor for NUV-excited white LEDs

Evaluation of the Structural, Near-Infrared Luminescence, and Radioluminescence Properties of Nd3+ Activated TTB-Lead Metatantalate Phosphors

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Tunable luminescence and improved thermostability via Tm―Dy energy transfer in a tellurooxyphosphate phosphor

Cited by 5 publications

References 69 publications

High recorded color rendering performance of single-structured Ce,Mn:Y 3(Al,Sc) 2Al 3O 12 phosphor ceramics for high-power white LEDs/LDs

High recorded color rendering performance of single-structured Ce,Mn:Y 3(Al,Sc) 2Al 3O 12 phosphor ceramics for high-power white LEDs/LDs

Lattice occupation and luminous properties of the K3YSi2O7:Tm3+,Dy3+ phosphor for NUV-excited white LEDs

Evaluation of the Structural, Near-Infrared Luminescence, and Radioluminescence Properties of Nd3+ Activated TTB-Lead Metatantalate Phosphors

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High recorded color rendering performance of single-structured Ce,Mn:Y ₃(Al,Sc) ₂Al ₃O ₁₂ phosphor ceramics for high-power white LEDs/LDs

High recorded color rendering performance of single-structured Ce,Mn:Y ₃(Al,Sc) ₂Al ₃O ₁₂ phosphor ceramics for high-power white LEDs/LDs