A Novel Red-Emitting Phosphor Ca2GdNbO6: Eu3+: Influences of Sintering Temperature and Eu3+ Concentration on the Photoluminescence

Zhang, Xin; Cui, Ruirui; Zhang, Jun; Qi, Xiaosi; Deng, Chaoyong

doi:10.1149/2162-8777/abe1d7

Cited by 23 publications

(10 citation statements)

References 43 publications

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“…To solve the above problems, new red phosphors should be used as a potential complement to the WLED field. [11][12][13] The use of excellent matrix materials is also one of the necessary conditions, and it is important to choose the main crystal structure. The luminescence properties of phosphor materials are closely related to the motion of energy carriers (electrons, photons, and phonons).…”

Section: Introductionmentioning

confidence: 99%

“…7 F J (J = 0, 1, 2, 3, 4) can emit pure red light. [13,14] In recent years, researchers have extensively studied Eu 3+ iondoped (A 2 BB'O 6 ) structural compounds. [15,16] Examples of double perovskite compounds are Ca 2 InSbO 6 :Eu 3+ , Ca 2 YTaO 6 :Eu 3+ , Ca 2 GdNbO 6 :Eu 3+ .…”

Section: Introductionmentioning

confidence: 99%

“…[15,16] Examples of double perovskite compounds are Ca 2 InSbO 6 :Eu 3+ , Ca 2 YTaO 6 :Eu 3+ , Ca 2 GdNbO 6 :Eu 3+ . [13,17,18] However, Eu 3+ ion-doped Ca 2 YNbO 6 (CYN) phosphors have not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

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A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

et al. 2022

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Due to the advantages of good physicochemical properties, thermal stability, and optical properties, double perovskite compounds have received extensive attention. On this basis, a new type of red phosphor, Ca2YNbO6:xEu3+, was synthesized using a high‐temperature solid‐phase method. Its phase purity, morphology, elemental composition, absorption spectrum, photoluminescence, thermal stability, and Commission Internationale de l'éclairage (CIE) chromaticity coordinates were thoroughly investigated. The results display that there is no impurity phase in the samples and the convergence factor Rwp = 14.2%; the microscopic particles are uniform and full, and the distribution of each element is uniform. The energy band gap ΔE is between 3.71 eV and 3.65 eV. The luminescence intensity is the best when the doped Eu3+ concentration x reaches 0.4, and emits 612 nm red light (5D0→7F2) under 465 nm excitation, and the concentration quenching is attributed to a d–d interaction. The luminescence intensity at 425 K was still 75% of the room temperature luminescence intensity, which indicates that the thermal stability is extremely superior. The CIE chromaticity coordinates (0.6534, 0.3455) of the Ca2YNbO6:0.4Eu3+ phosphors are very close to National Television Standards Committee (0.670, 0.330), and the samples have low correlated colour temperature (2656 K) and high colour purity (99.90%). All findings suggest that Ca2YNbO6:Eu3+ can serve as a substitute for red phosphor in WLEDs.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

et al. 2022

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“…In order to create traditional pc-WLEDs, several phosphors are mixed with gels used to paint the chips of LED, and as a result, this will lower the pc-WLEDs' effectiveness and chromatic genuineness, caused by the incomplete re-absorption among the phosphors with an overlay of the spectrum [10]. A structure with layers separated, with a red layer of phosphor placed beneath the yellow layer, has shown the ability to impede the impact of re-absorption [9], [11], [12]. As far we are concerned, there have been no studies before that use divided layers in triple-phosphor WLEDs.…”

Section: Introductionmentioning

confidence: 99%

Two-layer remote phosphor package as a solution to promote color quality scale and lumen in WLEDs

Huu

Thi

2022

Bulletin EEI

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This article demonstrates the influence of the red-light LaAsO4:Eu3+ phosphorus on the optical features of the two structures: one-layer remote phosphorus scheme (SRPS) and two-layer remote phosphorus scheme (DRPS). As a result, the Mie hypothesis is used to demonstrate and prove the comparison between color quality and luminosity (LF) between these two factors. The SRPS is a phosphor layer that consists of LaAsO4:Eu3+ particles combined with the YAG:Ce3+ mixture. Meanwhile, DRPS is two phosphor layers of red and yellow separated from each other. To improve the dispersing property, 5% of SiO2 is combined with the phosphorous films. The difference between the structures influences the optical features of WLEDs. The obtained outcomes show that the color rendering index (CRI) rises along with the concentrations of both structures while these values are nearly identical to each other. Meanwhile, at ACCTs (5600 K - 8500 K), the color quality scale (CQS) in DRPS reaches 74, which is higher than SRPS's 71 at 8500 K. Besides, the lumen in DRPS is considerably greater than that in SRPS at 2%-14% LaAsO4:Eu3+. In short, DRPS brings considerable benefits to the color quality and lumen when compared to SRPS. In addition, choosing a suitable concentration also becomes highly vital to achieve desirable CQS and LF.

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“…Therefore, a series of Ca 2 BB′O 6 :0.1Eu 3+ (B = Y, Gd, and La; B′ = Sb and Nb) luminescent materials with A 2 BB′O 6 double-perovskite structures was successfully obtained through a high-temperature solid-state method. Although the luminescent behaviors of Ca 2 GdNbO 6 :Eu 3+ , Ca 2 GdSbO 6 :Eu 3+ , and Ca 2 YSbO 6 :Eu 3+ phosphors have been recently studied, − we aimed to investigate and compare the PL properties of the Eu 3+ -activated Ca 2 BB′O 6 :0.1Eu 3+ (B = Y, Gd, and La; B′ = Sb and Nb) luminescent materials under the same synthesis processes and testing conditions. The phase structure, elemental composition, PL excitation (PLE), PL emission, thermal stability, decay curve, color purity, and QY of the resultant samples were analyzed.…”

Section: Introductionmentioning

confidence: 99%

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca₂BB′O₆ (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

Hua

2021

ACS Sustainable Chem. Eng.

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At present, rare-earth-activated perovskite-type materials have attracted lots of interest from researchers owing to their excellent advantages of unique electron properties and stable structure. This present work was designed to synthesize, investigate, and compare the photoluminescence properties in europium(III) (Eu 3+ )-activated Ca 2 BB′O 6 (B = Y, Gd, and La; B′ = Sb and Nb) double-perovskite (A 2 BB′O 6 ) luminescent materials. The doped Eu 3+ ions substitute the B sites of Y 3+ , Gd 3+ , and La 3+ ions, which are distributed to the equilibrium valence state and exhibit little difference in ion radius among them. All the resultant samples have a monoclinic structure, and the B sites strongly affect the space group in double-perovskite Ca 2 BB′O 6 frameworks. Additionally, the emission intensity, thermal stability, decay curve, color purity, quantum yield (QY), etc. were determined. The Ca 2 BNbO 6 :Eu 3+ (B = Y, Gd, and La) frameworks have good QYs (>42%), which are promising for white-light-emitting diodes (WLEDs). Besides, the red-emitting Ca 2 BB′O 6 :Eu 3+ − polydimethylsiloxane (PDMS) and white-emitting CYN0.1Eu 3+ −commercial phosphors (CP)−PDMS films were fabricated. Eventually, the packaged WLEDs based on the Ca 2 BNbO 6 :Eu 3+ (B = Y, Gd, and La) powders and a novel white-emitting structure based on the CYN:0.1Eu 3+ −CP−PDMS film were confirmed to have suitable color rendering index and correlated color temperature values for indoor illumination.

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A Novel Red-Emitting Phosphor Ca₂GdNbO₆: Eu³⁺: Influences of Sintering Temperature and Eu³⁺ Concentration on the Photoluminescence

Cited by 23 publications

References 43 publications

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

Two-layer remote phosphor package as a solution to promote color quality scale and lumen in WLEDs

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca₂BB′O₆ (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

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A Novel Red-Emitting Phosphor Ca2GdNbO6: Eu3+: Influences of Sintering Temperature and Eu3+ Concentration on the Photoluminescence

Cited by 23 publications

References 43 publications

A novel red phosphor Ca2YNbO6:Eu3+ for WLEDs

A novel red phosphor Ca2YNbO6:Eu3+ for WLEDs

Two-layer remote phosphor package as a solution to promote color quality scale and lumen in WLEDs

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca2BB′O6 (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes

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A Novel Red-Emitting Phosphor Ca₂GdNbO₆: Eu³⁺: Influences of Sintering Temperature and Eu³⁺ Concentration on the Photoluminescence

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

A novel red phosphor Ca₂YNbO₆:Eu³⁺ for WLEDs

Advantageous Occupation of Europium(III) in the B Site of Double-Perovskite Ca₂BB′O₆ (B = Y, Gd, La; B′ = Sb, Nb) Frameworks for White-Light-Emitting Diodes