Preparation and luminescent properties of KBaYSi2O7:RE3+ (RE = Dy, Eu) single-host phosphors for white LED

Zhao, Wenyu; Wen, Huixia; Yang, Xiaodong; Qiao, Xiaojie

doi:10.1016/j.matlet.2019.127104

Cited by 15 publications

(3 citation statements)

References 21 publications

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“…As such, phosphors play significant roles in WLEDs, determining various properties of WLEDs such as the color-rendering index (CRI), correlated color temperature (CCT), luminous efficiency, and color purity (CP). Rare-earth-based phosphors are the most widely used for the construction of WLEDs because of their high luminous efficiency and stability; , however, they generally suffered from practical constrains such as high cost, nonrenewable sources, as well as environmental pollution. , As a result, semiconductor-based quantum dots (SQDs) with narrow emissions, high photoluminescence (PL) stability, and quantum yields (QYs), as well as controllable particle sizes have become the preferred alternatives. Still, the applications of SQDs as white phosphors are heavily limited because of their very nature, which generally contains toxic metals such as Cd, Pd, and so forth. , …”

Section: Introductionmentioning

confidence: 99%

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Han

et al. 2022

ACS Appl. Nano Mater.

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The preparation of multicolor and white light-emitting carbon dots (CDs) is of both significant importance and challenging for their applications as white phosphors for light-emitting diodes (LEDs). In this report, a facile reaction system that is capable of preparing both multicolor and white light-emitting CDs was disclosed. In this system, three CDs emitting yellow, red, and green lights were prepared, and monochromatic LEDs were constructed using these multicolor CDs. Most importantly, single-component white light-emitting CDs with CIE coordinates of (0.33, 0.33) were also prepared. The white light-emitting CDs were applied as single-component white phosphors for the fabrication of white LEDs. The white LEDs constructed demonstrated excellent performance, emitting warm white light (CCT = 3723 K) with CIE coordinates of (0.39, 0.37) and an extremely high color-rendering index of 91.5, which should find favorable applications for indoor illumination.

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Section: Introductionmentioning

confidence: 99%

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Han

et al. 2022

ACS Appl. Nano Mater.

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“…Therefore, in order to regulate color temperature for warm white light emitting, it is necessary to develop phosphors with red light component. The spectra of Sm 3+ ions include orange-red light, and its excitation spectra match well with the emission spectra from commercial near ultraviolet (NUV) semiconductor LEDs, which has great prospects in the development of NUV excited white light LEDs [20].…”

Section: Introductionmentioning

confidence: 71%

Photoluminescence properties of Ba0.7Sr0.3TiO3:Sm3+ modified K0.5Na0.5NbO3 perovskite oxide ceramics

Sun,

Liu,

Wang

et al. 2023

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Ba0.7Sr0.3TiO3:Sm3+ modified KxNa(1-x)NbO3 ceramics with perovskite-type structure were synthesized via solid state sintering method. Sm3+ ions doping was designed for substituting both A and B sites in the ABO3 structure, Sm3+ doped Ba0.7Sr0.3TiO3 (Ba0.7Sr0.3TiO3:Sm3+) oxide precursor powders with the chemical formula of Ba0.7Sr0.3-xSmx(Ti1-xSmx)O3 (x=0.005 ， 0.015 ， 0.025) were synthesized. Combined Ba0.7Sr0.3TiO3:Sm3+ with K0.5Na0.5NbO3, the perovskite-type solid solution composite ceramics were fabricated via solid phase sintering method. X-Ray diffraction was used for investigating the phase structure of the precursor powders and luminescent composite ceramics. The photoluminescence properties of the Sm3+ ions in the Ba0.7Sr0.3TiO3-K0.5Na0.5NbO3 composite ceramic materials were systematically investigated by exploring the effects of composition of the composites, excitation wavelength and temperature on photoluminescence.

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“…White Light Emitting Diodes (WLEDs) have been widely used in various fields because of their numerous advantages, including high safety, excellent luminosity, extended lifetime, high energy efficiency and environmental friendliness. [1][2][3][4][5] The white light characteristics of illumination have become one of the concerns for quality assurance of display devices. [6] However, according to the investigation, the color coordinate of white light produced by Er 3 + /Yb 3 + /Tm 3 + ions doped tellurite-zinc glasses, [7] Sr 3 La(PO 4 ) 3 : Eu 2 + /Mn 2 + phosphor, [8] SrBPO 5 : Ce 3 + /Dy 3 + phosphors [9] are not very close to the standard white-light color coordinates (0.33,0.33), and could not meet the demand of white light tunability well.…”

Section: Introductionmentioning

confidence: 99%

Luminescence and Energy Transfer Properties of Color‐Tunable Dy³⁺, Eu³⁺ co‐Activated NaGdSiO₄ Phosphor for WLED with Great Thermo‐Stability

Wang,

Chai

et al. 2024

ChemPhysChem

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A series of NaGd1‐x‐ySiO4: y Dy3+ ‐ x Eu3+ phosphors were synthesized by a high‐temperature solid‐phase method. The optimal doping ion concentration of Dy3+ ions for this phosphor was determined to be 1% from the emission spectra. The energy transfer between Dy3+ and Eu3+ ions at 351 nm was investigated by photoluminescence spectra and fluorescence decay curves. At the excitation wavelengths of 275 nm, 351 nm, 366 nm, and 394 nm, a change from yellow to white to red light can be realized by adjusting the doping concentration of Eu/Dy ions. Particularly, by testing the temperature‐dependent fluorescence spectrum of the phosphor, it can be found that the luminous intensity of the phosphor is as high as 96% when 394 nm excitation is employed at 413 K. It was the maximum at this temperature comparing with other phosphors as far as we know. The color coordinate values show that the NaGd1‐x‐ySiO4: x Dy3+ ‐ y Eu3+ phosphors are very close to the white light color coordinates (x = 0.33, y = 0.33) under 351 nm excitation. Meanwhile, the correlated color temperature is between 5062 – 7104 K. These results indicate that this phosphor is a promising candidate for high‐quality WLED.

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Preparation and luminescent properties of KBaYSi2O7:RE3+ (RE = Dy, Eu) single-host phosphors for white LED

Cited by 15 publications

References 21 publications

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Photoluminescence properties of Ba0.7Sr0.3TiO3:Sm3+ modified K0.5Na0.5NbO3 perovskite oxide ceramics

Luminescence and Energy Transfer Properties of Color‐Tunable Dy³⁺, Eu³⁺ co‐Activated NaGdSiO₄ Phosphor for WLED with Great Thermo‐Stability

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Preparation and luminescent properties of KBaYSi2O7:RE3+ (RE = Dy, Eu) single-host phosphors for white LED

Cited by 15 publications

References 21 publications

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Multicolor and Single-Component White Light-Emitting Carbon Dots from a Single Precursor for Light-Emitting Diodes

Photoluminescence properties of Ba0.7Sr0.3TiO3:Sm3+ modified K0.5Na0.5NbO3 perovskite oxide ceramics

Luminescence and Energy Transfer Properties of Color‐Tunable Dy3+, Eu3+ co‐Activated NaGdSiO4 Phosphor for WLED with Great Thermo‐Stability

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Luminescence and Energy Transfer Properties of Color‐Tunable Dy³⁺, Eu³⁺ co‐Activated NaGdSiO₄ Phosphor for WLED with Great Thermo‐Stability