A new perovskite type Ba2YZrO6: Eu3+ red phosphor with cubical morphology for WLEDs applications

Rajkumar, G. Abraham; Ponnusamy, V.; Kanmani, G.V.; Jose, M.T.

doi:10.1016/j.jlumin.2020.117561

Cited by 34 publications

(9 citation statements)

References 63 publications

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“…Figure 15 shows CIE 1931 chromaticity coordinates for the NMLS:Eu 3+ phosphor at different concentrations (1–17 mol% at intervals of two) using CIE software. Colour purity is evaluated using the following formula to further evaluate the chromatic property and quality of the emission for device application: [ 87,88 ]

colour purity goodbreak= \frac{\sqrt{{((), x goodbreak- x_{i})}^{2} {((), y goodbreak- y_{i})}^{2}}}{\sqrt{{((), x_{d} goodbreak- x_{i})}^{2} {((), y_{d} goodbreak- y_{i})}^{2}}}

where (x, y) is the colour coordinate of the prepared phosphors, (x i , y i ) is energy point, and (x d , y d ) presents the colour coordinate of the dominant wavelength.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 15 shows CIE 1931 chromaticity coordinates for the NMLS:Eu 3+ phosphor at different concentrations (1-17 mol% at intervals of two) using CIE software. Colour purity is evaluated using the following formula to further evaluate the chromatic property and quality of the emission for device application: [87,88] colour purity…”

Section: Commission Internationale De L' Eclairage (Cie) Chromaticity...mentioning

confidence: 99%

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Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

et al. 2022

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A new red-emitting Eu 3+ (1À17 mol%)-doped Na 3 Mg 4 LiSi 12 O 30 (NMLS) phosphor was prepared using a conventional solid-state reaction method at low temperature.The prepared samples belong to a hexagonal structure with a good match to JCPDS card no. 73-0934. The photoluminescence (PL) emission spectrum showed an intense peak at 612 nm when excited at 393 nm. The variation of electric dipole transition ( 5 D 0 -7 F 2 ) emission intensity with increasing Eu 3+ ion concentration was investigated. The concentration quenching at 11 mol% is due to the dipole-dipole interaction mechanism in the NMLS host. The optimized NMLS:Eu 3+ phosphor shows 2.18 times higher luminescence intensity than the (Y,Gd)BO 3 (YGB) commercial phosphor. The NMLS:Eu 3+ showed an intense red emission, having Commission Internationale de l'éclairage (CIE) coordinates (0.6280, 0.3691) and colour purity of 99.2%.The resulting phosphor exhibits good thermal stability of 80% at 423 K. The magnified images of fingerprint showed various minute features such as bridges, sweat pores, ridge end, bifurcation, island and core with better visualization under 393 nm excitation. Furthermore, the optimized NMLS:Eu 3+ was used for pc-LED, latent fingerprints, and anticounterfeit applications as a promising red phosphor.

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colour purity goodbreak= \frac{\sqrt{{((), x goodbreak- x_{i})}^{2} {((), y goodbreak- y_{i})}^{2}}}{\sqrt{{((), x_{d} goodbreak- x_{i})}^{2} {((), y_{d} goodbreak- y_{i})}^{2}}}

where (x, y) is the colour coordinate of the prepared phosphors, (x i , y i ) is energy point, and (x d , y d ) presents the colour coordinate of the dominant wavelength.…”

Section: Resultsmentioning

confidence: 99%

Section: Commission Internationale De L' Eclairage (Cie) Chromaticity...mentioning

confidence: 99%

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

et al. 2022

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“…Nevertheless, it can be found that the Ω 2 of most Eu 3+ -doped phosphors is >Ω 4 . [68][69][70] Thus, the low Ω 2 /Ω 4 ratio in BLGO: xEu 3+ may reflect the increase of the rotation distortion of EuO 8 polyhedron. [50] That is, the rotational distortion EuO 8 structure (distorted square antiprism (D 4d )) may be the main cause of 5 D 0 → 7 F 4 strong emission in BLGO: Eu 3+ .…”

Section: Judd-ofelt Analysismentioning

confidence: 99%

Anomalous ⁵D₀→⁷F₄ Transition of Eu³⁺‐Doped BaLaGaO₄ Phosphors for WLEDs and Plant Growth Applications

Ling‐Hu,

Guo,

et al. 2023

Advanced Optical Materials

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Europium (Eu3+) doped phosphors typically exhibit orange or red emission and are used in lighting and display applications, originating from the 5D0→7F1 and 5D0→7F2 transitions of Eu3+. However, BaLaGaO4: xEu3+ deep‐red phosphor, when excited by near‐ultraviolet light, is mainly 5D0→7F4 transition (703 nm). Meantime, the BaLaGaO4: 0.30Eu3+ exhibits a high I423K/I298K value of 71% and a high quantum yield of 82.54%. Furthermore, the prepared samples are mixed with commercial blue and green phosphors in a certain proportion to make white light‐emitting diodes (WLEDs). The color coordinate of the fabricated WLEDs is (0.3208, 0.3436), with a color rendering index of 91.9 and an R9 value of 73. Based on the unique spectral characteristics of this compound, a prototype device of a deep‐red LED with phosphor conversion is developed, which exhibits color coordinates (0.6294, 0.3581) and a color purity of 96.4%. The conducted germination experiments with plant seeds have provided compelling evidence regarding the considerable positive effects of the deep‐red LEDs on plant growth. These findings further emphasize the highly promising potential application of BaLaGaO4: Eu3+ deep‐red phosphor in WLEDs and plant growth lighting.

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“…Eu 3+ ion is usually utilized as the luminescent center in red-emitting phosphors doped with rare earth ions, which is mainly because it can effectively be excited by near UV and blue lights to show intense red emission due to its special 4f 6 shell structure. 6,7 In addition, the transition characteristics of Eu 3+ ions are closely related to the matrix structure. Therefore, selecting matrix materials is the key to preparing red phosphors with high color purity, luminescence efficiency, and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

A novel scheelite‐type LiCaGd(WO₄)₃:Eu³⁺ red phosphors with prominent thermal stability and high quantum efficiency

Wang

Xufeng

Liu

2023

Int J Applied Ceramic Tech

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A series of LiCaGd(WO4)3: xEu3+ (0 ≤ x ≤ 1.0) red phosphors with tetragonal scheelite structure were synthesized via the conventional solid‐state reaction. Their crystal structure, photoluminescence excitation (PLE), and photoluminescence (PL) spectra, thermal stability and quantum efficiency were investigated. The phosphors exhibit a typical red light upon 395 nm near ultraviolet excitation, and the strongest emission peak at 617 nm is dominated by the 5D0→7F2 transition of Eu3+ ions. The PL intensity of the phosphors gradually increases with the increase of Eu3+ doping concentration, and the concentration quenching phenomenon is hardly observed. The quantum efficiency and the color purity of the phosphor reach maximum values of about 94.2 and 96.6% at x = 1.0, respectively. More importantly, LiCaGd(WO4)3:xEu3+ phosphors have prominent thermal stability. The temperature‐dependent PL intensity of the phosphors at 423 K is only reduced to 89.1% of the PL intensity at 303 K, which is superior to that of commercial red phosphors Y2O3:Eu3+. Finally, LiCaGd(WO4)3:Eu3+ phosphor is packaged with near ultraviolet InGaN chips to fabricate white light emitting diodes, which has a low color temperature (CCT = 4622 K) and a high color rendering index (CRI= 89.6).

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A new perovskite type Ba2YZrO6: Eu3+ red phosphor with cubical morphology for WLEDs applications

Cited by 34 publications

References 63 publications

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

Anomalous ⁵D₀→⁷F₄ Transition of Eu³⁺‐Doped BaLaGaO₄ Phosphors for WLEDs and Plant Growth Applications

A novel scheelite‐type LiCaGd(WO₄)₃:Eu³⁺ red phosphors with prominent thermal stability and high quantum efficiency

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A new perovskite type Ba2YZrO6: Eu3+ red phosphor with cubical morphology for WLEDs applications

Cited by 34 publications

References 63 publications

Structural and optical properties of a new Milarite type Na3Mg4LiSi12O30:Eu3+ phosphor

Structural and optical properties of a new Milarite type Na3Mg4LiSi12O30:Eu3+ phosphor

Anomalous 5D0→7F4 Transition of Eu3+‐Doped BaLaGaO4 Phosphors for WLEDs and Plant Growth Applications

A novel scheelite‐type LiCaGd(WO4)3:Eu3+ red phosphors with prominent thermal stability and high quantum efficiency

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Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

Structural and optical properties of a new Milarite type Na₃Mg₄LiSi₁₂O₃₀:Eu³⁺ phosphor

Anomalous ⁵D₀→⁷F₄ Transition of Eu³⁺‐Doped BaLaGaO₄ Phosphors for WLEDs and Plant Growth Applications

A novel scheelite‐type LiCaGd(WO₄)₃:Eu³⁺ red phosphors with prominent thermal stability and high quantum efficiency