A novel banded structure ceramic phosphor for high-power white LEDs

Zhang, Jiyun; Luo, Zhaohua; Jiang, Haochuan; Jiang, Jun; Chen, Chunhua; Zhang, Jingxian; Gui, Zhenzhen

doi:10.1039/c7cc02172k

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…The current YAG‐based white laser light suffers from a low CRI value due to the sharp emission of LDs (FWHM ≈1 nm). For general laser lighting, a broad emission spectrum in the wavelength region of 400–800 nm is required, and red‐emitting components should be added to complement the red deficiency of YAG:Ce or LuAG:Ce . On the one hand, phosphors (especially yellow or orange‐emitting) with super‐broad emission bands are desired to achieve high CRI laser lighting.…”

Section: Discussionmentioning

confidence: 99%

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Wang

Hirosaki

et al. 2018

Laser & Photonics Reviews

273

191

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Solid‐state lighting is advancing toward higher power, higher brightness, and smaller size to cope with the market competitiveness, and laser‐driven solid‐state lighting technology is springing up owing to its super‐high brightness and compactness. These developments put forward new requirements for color conversion materials (i.e., phosphors). Here, the state‐of‐art achievements in laser phosphors are summarized, and the topics of luminescence saturation, light extraction efficiency, and light uniformity encountered in laser lighting technology are discussed. Several typical types of color converters, such as single crystal, phosphor ceramics, phosphor‐in‐glass, phosphor films, and quantum‐well light‐emitting diodes, are comparatively overviewed and discussed. The cutting‐edge applications of high‐brightness white laser light in lighting, displays, healthcare, and communications are summarized. The challenges and outlook in laser‐driven solid‐state lighting and some empirical rules for designing novel laser phosphors are highlighted.

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Section: Discussionmentioning

confidence: 99%

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Wang

Hirosaki

et al. 2018

Laser & Photonics Reviews

273

191

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“…The band structure of SISO was calculated obtained via the DFT approach 27 . The calculated band structure of pure SISO is shown in Figure 5(A).…”

Section: Resultsmentioning

confidence: 99%

“…The band structure of SISO was calculated obtained via the DFT approach. 27 The calculated band structure of pure SISO is shown in Figure 5 The diffuse reflection spectra of SISO and SISO:Mn 4+ phosphors were shown in Figure 5(C). SISO powder exhibits high transmittance of approximately 70% from 350 to 800 nm, whereas SISO:Mn 4+ shows two typical absorption bands in the range of 300−600 nm because of 4 T 1g → 4 A 2g and 4 T 2g → 4 A 2g transitions of Mn 4+ .…”

Section: 1mentioning

confidence: 99%

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

et al. 2021

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High‐efficiency and far‐red light phosphors based on Mn4+‐doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+‐doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+‐activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far‐red‐emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn4+ samples showed a far‐red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far‐red‐phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn4+ and SISO:0.006Mn4+, 0.006Li+ phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors‐based plant growth light‐emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs.

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“…It is worth mentioning that in addition to the application in the scintillators, it is also easier for the multicomponent garnet to achieve ultrashort pulse lasers with wavelength tunability due to the wider emission band [220][221][222][223]. Moreover, due to the higher brightness and tunable luminescence, the multicomponent garnets can also be prepared into phosphors and ceramics for high-power white LEDs by introducing different luminescent centers [224,225]. As the number of elements increases, the delineation of properties and applications of the garnet scintillators becomes less clear.…”

Section: Quaternary and Higher Garnet Ceramicsmentioning

confidence: 99%

Development and prospects of garnet ceramic scintillators: A review

et al. 2022

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Garnet ceramic scintillators are a class of inorganic scintillation materials with excellent overall performance. The flexibility of cation substitution in different lattice positions leads to tunable and versatile properties and a wide range of applications. This paper starts with an overview of the development history of the inorganic scintillation materials, followed by a description of major preparation methods and characterization of garnet scintillation ceramics. Great progress obtained in recent years consisting in applying the band-gap and defect engineering strategies to the garnet scintillation ceramics is reviewed. Finally, the respective problems in the preparation and performance of multicomponent garnet single crystals and ceramics and the effective solutions are discussed. The garnet scintillation ceramics with the highest application potential are summarized, and the future development directions are proposed.

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A novel banded structure ceramic phosphor for high-power white LEDs

Cited by 9 publications

References 17 publications

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs

Development and prospects of garnet ceramic scintillators: A review

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A novel banded structure ceramic phosphor for high-power white LEDs

Cited by 9 publications

References 17 publications

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

Color Conversion Materials for High‐Brightness Laser‐Driven Solid‐State Lighting

An efficient far‐red emission Sr2InSbO6:Mn4+, M (M = Li+, Na+, and K+) phosphors for plant cultivation LEDs

Development and prospects of garnet ceramic scintillators: A review

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An efficient far‐red emission Sr₂InSbO₆:Mn⁴⁺, M (M = Li⁺, Na⁺, and K⁺) phosphors for plant cultivation LEDs