Improving the thermal stability of phosphor in a white light-emitting diode (LED) by glass-ceramics: Effect of Al2O3 dopant

Su, Hongbin; Nie, Yu; Yang, Hsiwen; Tang, Dian; Chen, Kongfa; Zhang, Teng

doi:10.1016/j.jeurceramsoc.2017.10.037

Cited by 20 publications

(2 citation statements)

References 42 publications

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“…3 To fabricate a lighting device, typically, a yellow-emitting phosphor is dispersed in a silicon resin and spread on an InGaN chip. 4 When driving a bias current, the blue light emitted by the chip is absorbed by the phosphor, which simultaneously emits yellow light. This, together with the transmitted blue light, produces white light.…”

Section: Introductionmentioning

confidence: 99%

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Jang

Kim

et al. 2020

J. Am. Ceram. Soc.

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Upconversion phosphors have numerous advantages compared to down conversion phosphor materials, such as a weak background interface, low excitation energy, sharp emission lines, and long lifetimes. Conventionally, blue laser diodes are used to obtain strong white light by combining green-and red-emitting phosphors. The blue-excited white-light-emitting devices can be harmful when the blue light penetrates directly into the human body. However, lower energy excited lighting devices does not harm the human body because of their low-energy photons are compatible with the biologically safe window. Hence, we present a prototype device that converts invisible near-infrared light into visible white light. For this, we synthesized orange-emitting Y 2 O 3 :Er 3+ , Yb 3+ and blue-emitting Y 2 O 3 :Tm 3+ , Yb 3+ upconversion phosphors using a solid-state reaction. Using these, phosphor-in-glass (PiG) samples with sintered glass frit were prepared to investigate their optical behavior under lowexcitation energy. The emission color from the stacked PiGs depends on the color balance between the activator ions of Er 3+ , Tm 3+ , and Yb 3+ , and their balance is optimized to obtain a white light. The results might pave the way for designing safe white-light-emitting devices using a low-energy excitation source.

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Section: Introductionmentioning

confidence: 99%

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Jang

Kim

et al. 2020

J. Am. Ceram. Soc.

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“…PiG denotes a consolidated plate consisting of phosphor particles and inorganic glass with low melting temperature. wLEDs with PiG commonly adopted a remote-type configuration implying spatial separation of phosphor plates and chips to relieve the thermal damages. − Because of the superior thermal stability and chemical properties of PiG assisted with remote-type assembly of wLEDs, great stability against thermal degradation was achieved, which is difficult to achieve with conventional polymeric encapsulants such as epoxy, silicone, etc. − …”

Section: Introductionmentioning

confidence: 99%

Hybrid Nanoparticle Layers Toward Enhanced Luminescence of Phosphor Plates for White LEDs

Song

Kim

2020

ACS Appl. Mater. Interfaces

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MgF2 porous nanoparticle-silica hybrid coating layers were utilized to enhance luminescence efficiency of phosphor plates for white light-emitting diodes (wLEDs). Silica and chemically synthesized porous MgF2 nanoparticles were sequentially deposited by spin coating on the phosphor plate with phosphor-in-glass (PiG) configuration. Microscopic investigation the hybrid film suggested intermixing of silica and porous MgF2 nanoparticles. Numerical estimation based on transfer matrix method expected a significant reduction in reflectance and enhancement of transmission spectra by the hybrid coating. In accordance, the photoluminescence intensity of phosphor plates showed a drastic improvement and quantum yield were enhanced from 30% (for bare PiG plate) to 45% (for hybrid-layer-coated PiG plate). When assembled with blue LEDs, hybrid nanoparticle coating on the PiG phosphor plates improved luminescence efficacy from 40 to 49 lm/W without deterioration of chromaticity during operation. In addition, mechanical durability of the hybrid thin film was confirmed by an abrasion test. Conformal coating of matching layer consisting of porous MgF2 nanoparticles and silica can provide an efficient route to highly luminescent white LEDs with mechanical stability.

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Strategy to Construct High Thermal‐Stability Narrow‐Band Green‐Emitting Si‐CDs@MAs Phosphor for Wide‐Color‐Gamut Backlight Displays

Chen

Zou

et al. 2022

Advanced Optical Materials

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Developing innovative narrow‐band green‐emitting phosphors featuring low thermal quenching and eco‐friendliness for white light‐emitting diode (WLED) backlights is a pivotal challenge. Benefitting from narrowband and low toxicity of green‐emitting silanized carbon dots (Si‐CDs), an efficient confinement and protection strategy through embedding Si‐CDs in mesoporous aluminas (MAs) is proposed to construct MAs and Si‐CDs composites (Si‐CDs@MAs) with superior luminescence properties. Si‐CDs@MAs phosphor exhibits green emission at 526 nm with narrow full width at half maximum of 51 nm, zero‐thermal quenching even up to 423 K (104.1%@423 K of the emission peak intensity at 298 K), and the internal quantum efficiency of 64.46%. Compared with broad‐band yellow‐emitting solid‐state Si‐CDs (S‐Si‐CDs), the thermal stability, photostability, and water stability of Si‐CDs@MAs phosphor are remarkably improved due to surface protection. The WLED backlight is fabricated with optimized Si‐CDs@MAs phosphor, which shows high luminous efficacy of 117.43 lm W−1 and wide color gamut (107% NTSC). Furthermore, this work provides the design principles of realizing stable narrow‐band solid‐state fluorescence carbon dots, suggesting its great potential for wide‐color‐gamut display application.

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Improving the thermal stability of phosphor in a white light-emitting diode (LED) by glass-ceramics: Effect of Al2O3 dopant

Cited by 20 publications

References 42 publications

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Up‐conversion phosphor plate for white lighting device using NIR excitation source

Hybrid Nanoparticle Layers Toward Enhanced Luminescence of Phosphor Plates for White LEDs

Strategy to Construct High Thermal‐Stability Narrow‐Band Green‐Emitting Si‐CDs@MAs Phosphor for Wide‐Color‐Gamut Backlight Displays

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