A new single-component KCaY(PO4)2:Dy3+, Eu3+nanosized phosphor with high color-rendering index and excellent thermal resistance for warm-white NUV-LED

Wang, Xiaofei; Yang, Qi; Wang, Gui‐Gen; Wang, Xinzhong; Han, Jiecai

doi:10.1039/c6ra20912b

Cited by 31 publications

(13 citation statements)

References 59 publications

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“…The phosphor-free white-color μLEDs exhibit nearly a neutral white light emission, with correlated color temperature of ~ 4850 K. Additionally, a relatively high color rendering index (CRI) of ~ 94 was measured for this phosphor-free white-color μLED, which is extremely difficult to achieve using planar LED structures. Currently, phosphor-based white LEDs have CRI values in the range of 80–86 [45,46,47,48]. With some special design of phosphor converters, the CRI of these types of white LEDs can be increased up to 90–97 [49,50,51,52,53].…”

Section: Resultsmentioning

confidence: 99%

Full-Color InGaN/AlGaN Nanowire Micro Light-Emitting Diodes Grown by Molecular Beam Epitaxy: A Promising Candidate for Next Generation Micro Displays

et al. 2019

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We have demonstrated full-color and white-color micro light-emitting diodes (μLEDs) using InGaN/AlGaN core-shell nanowire heterostructures, grown on silicon substrate by molecular beam epitaxy. InGaN/AlGaN core-shell nanowire μLED arrays were fabricated with their wavelengths tunable from blue to red by controlling the indium composition in the device active regions. Moreover, our fabricated phosphor-free white-color μLEDs demonstrate strong and highly stable white-light emission with high color rendering index of ~ 94. The μLEDs are in circular shapes with the diameter varying from 30 to 100 μm. Such high-performance μLEDs are perfectly suitable for the next generation of high-resolution micro-display applications.

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Section: Resultsmentioning

confidence: 99%

Full-Color InGaN/AlGaN Nanowire Micro Light-Emitting Diodes Grown by Molecular Beam Epitaxy: A Promising Candidate for Next Generation Micro Displays

et al. 2019

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“…The two bands located at 580 and 533 cm −1 are due to the deformation bending of O-P-O (ν 4 (A1g + Eg)) while the intense band at 410 cm −1 is attributed to the bending vibration (ν 2 (Eg)). The external modes deriving from the vibrations of PO 4 and Ba-O bands below 400 cm −1 were observed at 207, 145, and 105 cm −1 [52,53].…”

Section: Fourier-transform Infrared Spectroscopy and Raman Spectramentioning

confidence: 98%

Barium Hydrogen Phosphate Electrodes for High Electrocatalytic and Photoelectrocatalytic Degradation of Rhodamine B in Neutral Medium: Optimization by Response Surface Methodology

et al. 2020

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Barium hydrogen phosphate (BaHPO 4 ) thin films were electrodeposited on fluorine-doped tin oxide (FTO) and used as electrocatalysts for organics degradation. The effects of applied current density and deposition time on the phase and morphology of electrodeposited films were analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy, Raman spectroscopy, electrochemical impedance spectroscopy (Mott-Schottky) plots, and photocurrent response. The electrodeposited BaHPO 4 films crystallize in the orthorhombic structure and form platelets on the FTO substrate. Response surface methodology (RSM) was used to optimize the operational conditions. Four independent process variables were considered: NaCl concentration, rhodamine B (RhB) initial concentration, applied current density, and reaction time. Based on the model prediction, the optimum conditions for RhB degradation were determined with the maximum RhB degradation of 98.78%. The corresponding experimental value of RhB degradation under the optimum conditions was determined as 99%, which is very close to the optimized one, implying that RSM is a powerful strategy for the process optimization. The photoelectrochemical degradation of RhB, performed at optimal operational conditions, allowed the very fast degradation rates of almost 99% during 7 min due to the synergic effect while combining photocatalysis and electrocatalysis.

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“…The KMeRE(PO 4 ) 2 phosphates show good luminescence and hence can be applied as efficient luminophores [19,20]. Recently, a series of KMeRE(PO 4 ) 2 (Me = Ca, Sr; RE = Y, La, Lu, Gd) have been investigated carefully [4,[21][22][23][24]. Wang et al successfully synthesized KCaY(PO 4 ) 2 :Dy 3+ , Eu 3+ as a nanosized phosphor-generated warm-white light with a high color rendering index (CRI) [23].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a series of KMeRE(PO 4 ) 2 (Me = Ca, Sr; RE = Y, La, Lu, Gd) have been investigated carefully [4,[21][22][23][24]. Wang et al successfully synthesized KCaY(PO 4 ) 2 :Dy 3+ , Eu 3+ as a nanosized phosphor-generated warm-white light with a high color rendering index (CRI) [23]. Basic information about KCaY(PO 4 ) 2 :Eu 3+ has been reported in 2006 by Wang et al [24].…”

Section: Introductionmentioning

confidence: 99%

Structural and Luminescence Behavior of Nanocrystalline Orthophosphate KMeY(PO4)2: Eu3+ (Me = Ca, Sr) Synthesized by Hydrothermal Method

et al. 2022

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KMeY(PO4)2:5% Eu3+ phosphates have been synthesized by a novel hydrothermal method. Spectroscopic, structural, and morphological properties of the obtained samples were investigated by X-ray, TEM, Raman, infrared, absorption, and luminescence studies. The microscopic analysis of the obtained samples showed that the mean diameter of synthesized crystals was about 15 nm. The KCaY(PO4)2 and KSrY(PO4)2 compounds were isostructural and they crystallized in a rhabdophane-type hexagonal structure with the unit-cell parameters a = b ≈ 6.90 Å, c ≈ 6.34 Å, and a = b ≈ 7.00 Å, c ≈ 6.42 Å for the Ca and Sr compound, respectively. Spectroscopic investigations showed intense 5D0 → 7F4 transitions connected with D2 site symmetry of Eu3+ ions. Furthermore, for the sample annealed at 500 °C, europium ions were located in two optical sites, on the surface of grains and in the bulk. Thermal treatment of powders at high temperature provided better grain crystallinity and only one position of dopant in the crystalline structure. The most intense emission was possessed by the KSrY(PO4)2: 5%Eu3+ sample calcinated at 500 °C.

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A new single-component KCaY(PO₄)₂:Dy³⁺, Eu³⁺nanosized phosphor with high color-rendering index and excellent thermal resistance for warm-white NUV-LED

Abstract: Single-component KCaY(PO4)2:Dy3+, Eu3+nanophosphor with high color-rendering index, low correlated color temperature and excellent thermal resistance for NUV-pumped warm-white LED.

Cited by 31 publications

References 59 publications

Full-Color InGaN/AlGaN Nanowire Micro Light-Emitting Diodes Grown by Molecular Beam Epitaxy: A Promising Candidate for Next Generation Micro Displays

Full-Color InGaN/AlGaN Nanowire Micro Light-Emitting Diodes Grown by Molecular Beam Epitaxy: A Promising Candidate for Next Generation Micro Displays

Barium Hydrogen Phosphate Electrodes for High Electrocatalytic and Photoelectrocatalytic Degradation of Rhodamine B in Neutral Medium: Optimization by Response Surface Methodology

Structural and Luminescence Behavior of Nanocrystalline Orthophosphate KMeY(PO4)2: Eu3+ (Me = Ca, Sr) Synthesized by Hydrothermal Method

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