Facile preparation and optical properties of Te/Pb-free Y3Al5O12:Ce3+ phosphor-in-glass via a screen-printing route for high-power WLEDs

Xia, Libin; Yue, Yuanying; Yang, Xueli; Deng, Yuan; Li, Chengyue; Zhuang, Yijun; Wang, Ruixiang; You, Weixiong; Liang, Tongxiang

doi:10.1016/j.jeurceramsoc.2019.05.031

Cited by 26 publications

(9 citation statements)

References 28 publications

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Section: Resultsmentioning

confidence: 99%

“…Thermal stability is of great importance affecting the luminescence performance, it is indispensable to evaluate the thermal quenching behavior and chromaticity stability of phosphor. 20,[26][27][28][29][30][31][32][33] The temperature-dependent PL spectra of Li 2 Ca 2 Mg 2 Si 2 N 6 :1.0%Eu 2+ from room temperature (RT) to 473 K are depicted in Figure 5A-B. With the temperature increasing, the emission intensity gradually decreases attributed to thermal quenching effect and the peak wavelength shows a slight blueshift.…”

Section: Resultsmentioning

confidence: 99%

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Facile synthesis of the desired red phosphor Li₂Ca₂Mg₂Si₂N₆:Eu²⁺ for high CRI white LEDs and plant growth LED device

Yang

Zhang

et al. 2019

J Am Ceram Soc

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The red emission with suitable peak wavelength and narrow band is acutely required for high color rendering index (CRI) white LEDs without at the cost of the luminous efficacy. Herein, the Li2Ca2Mg2Si2N6:Eu2+ red phosphor was prepared with facile solid‐state method using Ca3N2, Mg3N2, Si3N4, Li3N, and Eu2O3 as the safety raw materials under atmospheric pressure for the first time, which shows red emission peaking at 638 nm with full width at half maximum (FWHM) of 62 nm under blue light irradiation and becomes the desired red phosphor to realize the balance between luminous efficacy and high CRI in white LEDs. The morphology, structure, luminescence properties, thermal quenching behavior, and chromaticity stability of the Li2Ca2Mg2Si2N6:Eu2+ phosphor are investigated in detail. Concentration quenching occurs when the Eu2+ content exceeds 1.0 mol%, whereas high‐temperature photoluminescent measurements show a 32% drop from the room‐temperature efficiency at 423 K. In view of the excellent luminescence performances of Li2Ca2Mg2Si2N6:Eu2+ phosphor, a white LEDs with CRI of 91 as a proof‐of‐concept experiment was fabricated by coating the title phosphor with Y3Al5O12:Ce3+ on a blue LED chip. In addition, the potential application of the title phosphor in plant growth LED device was also demonstrated. All the results indicate that Li2Ca2Mg2Si2N6:Eu2+ is a promising red‐emitting phosphor for blue LED‐based high CRI white LEDs and plant growth lighting sources.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Facile synthesis of the desired red phosphor Li₂Ca₂Mg₂Si₂N₆:Eu²⁺ for high CRI white LEDs and plant growth LED device

Yang

Zhang

et al. 2019

J Am Ceram Soc

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“…Phosphor-converted white-light-emitting diodes (wLEDs) have been studied widely to develop more stable and efficient wLEDs (Xia et al, 2019). Investigating the emission mechanism of long-afterglow phosphors will help realize various applications in lighting.…”

Section: Introductionmentioning

confidence: 99%

Visualizing the valence states of europium ions in Eu-doped BaAl₂O₄ using X-ray nanoprobe mapping

Lin

Chen

et al. 2022

J Synchrotron Radiat

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This study develops and successfully demonstrates visualization methods for the characterization of europium (Eu)-doped BaAl2O4 phosphors using X-ray nanoprobe techniques. X-ray fluorescence (XRF) mapping not only gives information on the elemental distributions but also clearly reveals the valence state distributions of the Eu2+ and Eu3+ ions. The accuracy of the estimated valence state distributions was examined by performing X-ray absorption spectroscopy (XAS) across the Eu L 3-edge (6.977 keV). The X-ray excited optical luminescence (XEOL) spectra exhibit different emission lines in the selected local areas. Their corresponding emission distributions can be obtained via XEOL mapping. The emission properties can be understood through correlation analysis. The results demonstrate that the main contribution to the luminescence intensity of the Eu-doped BaAl2O4 comes from the Eu2+ activator and the emission intensity will not be influenced by the concentration of Eu2+ or Eu3+ ions. It is anticipated that X-ray nanoprobes will open new avenues with significant characterization ability for unravelling the emission mechanisms of phosphor materials.

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“…Among them, phosphor-in-glass (PiG) is a suitable candidate that additionally requires lower fabrication temperatures than other materials. 7,8 Phosphors generally follow the Stokes law, which simply states that the excited photons have higher energy than the emitted ones. However, some inorganic phosphors activated by rare-earth ions can excite electrons from specific low-energy levels to higher ones, which is called an anti-Stokes process.…”

Section: Introductionmentioning

confidence: 99%

“…To avoid a such reduction in the efficiency of a device, the use of chemically stable inorganic materials such as Al 2 O 3 and phosphor ceramic plates have been proposed. Among them, phosphor‐in‐glass (PiG) is a suitable candidate that additionally requires lower fabrication temperatures than other materials 7,8 …”

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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Facile preparation and optical properties of Te/Pb-free Y3Al5O12:Ce3+ phosphor-in-glass via a screen-printing route for high-power WLEDs

Cited by 26 publications

References 28 publications

Facile synthesis of the desired red phosphor Li₂Ca₂Mg₂Si₂N₆:Eu²⁺ for high CRI white LEDs and plant growth LED device

Facile synthesis of the desired red phosphor Li₂Ca₂Mg₂Si₂N₆:Eu²⁺ for high CRI white LEDs and plant growth LED device

Visualizing the valence states of europium ions in Eu-doped BaAl₂O₄ using X-ray nanoprobe mapping

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

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Facile preparation and optical properties of Te/Pb-free Y3Al5O12:Ce3+ phosphor-in-glass via a screen-printing route for high-power WLEDs

Cited by 26 publications

References 28 publications

Facile synthesis of the desired red phosphor Li2Ca2Mg2Si2N6:Eu2+ for high CRI white LEDs and plant growth LED device

Facile synthesis of the desired red phosphor Li2Ca2Mg2Si2N6:Eu2+ for high CRI white LEDs and plant growth LED device

Visualizing the valence states of europium ions in Eu-doped BaAl2O4 using X-ray nanoprobe mapping

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

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Facile synthesis of the desired red phosphor Li₂Ca₂Mg₂Si₂N₆:Eu²⁺ for high CRI white LEDs and plant growth LED device

Facile synthesis of the desired red phosphor Li₂Ca₂Mg₂Si₂N₆:Eu²⁺ for high CRI white LEDs and plant growth LED device

Visualizing the valence states of europium ions in Eu-doped BaAl₂O₄ using X-ray nanoprobe mapping