Highly Reliable WLEDs With All-Inorganic Packaging Structure by Soldering Phosphor-in-Glass

Liang, Dandan; Liu, Jiaxin; Wang, Hao; Mou, Yun; Peng, Yang

doi:10.1109/lpt.2020.2980028

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…Borosilicate glass matrix has obvious advantages over other glass matrices. For example, compared with tellurite, it has excellent sintering properties and high visible light transparency without significant interaction with phosphors 18–20 …”

Section: Introductionmentioning

confidence: 99%

“…For example, compared with tellurite, it has excellent sintering properties and high visible light transparency without significant interaction with phosphors. [18][19][20] In this work, yellow-green phosphors with garnet structure were prepared by co-ion substitution and integrated into PiG films by co-sintering at low temperatures. The color rendering quality of warm-white-light devices is improved by making up for blue and yellow depressions.…”

Section: Introductionmentioning

confidence: 99%

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Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

Zhang

Zhao

et al. 2023

J Am Ceram Soc.

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Compared with other fluorescent crystal phases, garnet has better structural stability in a glass matrix and renders precisely controllable emissions due to the abundant lattice control positions. In this work, we regulate the coordination field of Ce3+ ion based on the co‐substitution method and achieve the spectra regulation in the yellow–green range. We used Ba2+–Si4+ cations to replace Y3+–Al3+ cations in Y3Al5O12 (YAG) matrix to obtain blue‐shift of the emission peak from 552 to 539 nm. The centroid shift and crystal field splitting decrease with the decreasing covalency of the bond between the Ce3+ ion and the surrounding anions owing to the higher electronegativity of Si4+ ions than Al3+ ions. The corresponding fluorescent films were prepared by a low‐temperature co‐sintering process based on the as‐made Ba2+–Si4+ co‐substituted phosphor. X‐ray powder diffractometer and scanning electron microscopy images showed that the fluorescence crystals were less eroded and evenly dispersed in the glass matrix. Spectral analysis showed that the garnet phase was protected by using lead‐free borosilicate glass with a low melting point, and the quantum efficiency of phosphor‐in‐glass (PiG) retains 98% of the corresponding phosphor. By adjusting the ratio of garnet phosphor to commercial red nitride phosphors, a warm white fluorescence with a color rendering index of 80.3 and color temperature of 3899 K was obtained. The prepared warm white film has potential application value in the whole spectra field.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

Zhang

Zhao

et al. 2023

J Am Ceram Soc.

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“…The organic encapsulations unavoidably lead to aging issues during long-term service, resulting in the performance degradation of WLEDs. 40,41 Therefore, there is a requirement to fabricate a thermally stable converter with high color rendering for the all-inorganic packaging of high-power WLEDs.…”

Section: Introductionmentioning

confidence: 99%

“…Although the approach of ultraviolet-excited trichromatic phosphors can enhance the CRI, the multicolor PiG-based WLEDs display low efficiency owing to the low quantum efficiency and abominable thermal decay of trichromatic phosphors. , In addition, most color converters use organic resins as bonding materials for the remote-type packaging of WLEDs. The organic encapsulations unavoidably lead to aging issues during long-term service, resulting in the performance degradation of WLEDs. , Therefore, there is a requirement to fabricate a thermally stable converter with high color rendering for the all-inorganic packaging of high-power WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Broad-Band and Stable Phosphor-in-Glass Enabling Ultrahigh Color Rendering for All-Inorganic High-Power WLEDs

Peng

Wang

Liu

et al. 2020

ACS Appl. Electron. Mater.

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All-inorganic color converters are promising luminescent materials for high-power white lighting due to their excellent heat resistance and high thermal conductivity. However, the low color rendering of converters limits their applications in high-quality lighting. Herein, a broad-band and stable phosphor-in-glass (PiG) was developed for high-power white light-emitting diodes (WLEDs). This PiG converter was fabricated by sintering a green/red phosphor glass film on a glass plate with a patterned metal layer. The green Y3Al3.08Ga1.92O12:Ce3+ phosphor has a broad emission, which compensates for the cyan cavity between blue and green emission spectra, and then produces full-spectrum white light combined with the red CaAlSiN3:Eu2+ phosphor. The all-inorganic WLEDs were realized by welding the PiG on a substrate. The optical performance of PiG-based WLEDs was optimized by varying the film thickness. At the film thickness of 150 μm, the fabricated WLEDs achieve ultrahigh color quality of color rendering index (CRI) values (R a = 95.4, R 9 = 95.1, and R 13 = 97.3) and fidelity/gamut index values (R f = 91 and R g = 102). The corresponding luminous efficacy (LE) and correlated color temperature (CCT) are 65 lm/W and 5260 K, respectively. After aging at 100 °C for 200 h, the PiG-based WLEDs exhibit low efficiency loss and stable color quality compared with the traditional phosphor-in-silicone (PiS)-based WLEDs. The prepared PiG is a broad-band and stable converter enabling ultrahigh color rendering for high-power white lighting.

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Phosphor-in-glass film sintered on sapphire lens for laser welding hermetic packaging of high-power white LEDs

Luo,

Zhao,

Ding

et al. 2024

Ceramics International

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Highly Reliable WLEDs With All-Inorganic Packaging Structure by Soldering Phosphor-in-Glass

Cited by 8 publications

References 30 publications

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

Broad-Band and Stable Phosphor-in-Glass Enabling Ultrahigh Color Rendering for All-Inorganic High-Power WLEDs

Phosphor-in-glass film sintered on sapphire lens for laser welding hermetic packaging of high-power white LEDs

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Highly Reliable WLEDs With All-Inorganic Packaging Structure by Soldering Phosphor-in-Glass

Cited by 8 publications

References 30 publications

Inorganic remote glass film based on yellowish‐green (Y, Ba)3(Al, Si)5O12:Ce garnet phosphor for warm white LEDs

Inorganic remote glass film based on yellowish‐green (Y, Ba)3(Al, Si)5O12:Ce garnet phosphor for warm white LEDs

Broad-Band and Stable Phosphor-in-Glass Enabling Ultrahigh Color Rendering for All-Inorganic High-Power WLEDs

Phosphor-in-glass film sintered on sapphire lens for laser welding hermetic packaging of high-power white LEDs

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Product

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Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs

Inorganic remote glass film based on yellowish‐green (Y, Ba)₃(Al, Si)₅O₁₂:Ce garnet phosphor for warm white LEDs