A study of optical properties and site preference of Bi3+/Eu3+ co-doped CaLa4Si3O13 red-emitting phosphors for w-LED applications

Shen, Bingqing; Chen, Baojiu; Zhang, Yuanpeng; Hu, Jianxu

doi:10.1016/j.jlumin.2019.116821

Cited by 34 publications

(5 citation statements)

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“…[5][6][7][8] Generally, combining YAG:Ce yellow phosphor with blue LED chips manufactures WLEDs. 2,[9][10][11] However, this combination has disadvantages on low color rendering index (CRI < 75) and a high correlated color temperature (CCT > 4500 K) due to lack of red composition in emission spectra, [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] which is not suitable for general lighting because this strong blue light is harmful to human eyes. In order to overcome this weakness, another technology of manufactured WLED device has been widely proposed, which is based on the near-ultraviolet (n-UV, 380-420 nm) emitting LED chip combined with tricolor (red, green, and blue) emitting phosphors.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, phosphor‐converted white light‐emitting diodes (WLEDs), a new generation of solid‐state light source based on the combination of phosphor and light‐emitting diode, have developed rapidly because their prominent strengths outweigh the traditional light sources, such as energy saving, longer lifetimes, high efficiency, and environmental friendliness 5–8 . Generally, combining YAG:Ce yellow phosphor with blue LED chips manufactures WLEDs 2,9–11 . However, this combination has disadvantages on low color rendering index (CRI < 75) and a high correlated color temperature (CCT > 4500 K) due to lack of red composition in emission spectra, 12–28 which is not suitable for general lighting because this strong blue light is harmful to human eyes.…”

Section: Introductionmentioning

confidence: 99%

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A tunable blue–cyan dual emission phosphor in Ca₄₋_xLu₂_xHf₁₋_xGe₃O₁₂:Bi³⁺ via forming segregation structure for WLEDs

et al. 2022

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White light-emitting diodes (WLEDs) are always fabricated by a combination of the near-ultraviolet (n-UV)-emitting LED chip with tricolor emitting phosphors.However, improving the color rendering index (CRI) is limited due to the absence of cyan composition for common commercial combinations. Based on this, a series of blue-cyan dual-peaks emission Ca 4−x Lu 2x Hf 1−x Ge 3 O 12 (CLHGO):Bi 3+ phosphors with unique adjustability are developed by the solid solution design strategy. All the samples belong to the garnet structure with the Ia3d space group. Two relatively independent segregation structures [Ca 4 HfGe 3 O 12 ] and [Ca 3 Lu 2 Ge 3 O 12 ] are established in the samples. When Bi 3+ ions enter into the highly symmetrical hexagon coordination environment, a special phenomenon appears that the emission peaks consist of two stabilized narrowband emission bands at 435 and 475 nm, their intensity ratio could change continuously with the increase of solid solubility. All these results are confirmed by means of excitation and emission spectra, first principles calculation and decay curves. The Ca 3.4 Lu 1.2 Hf 0.4 Ge 3 O 12 :Bi 3+ sample, with a high efficiency around 84.1% and an excellent thermal stability (65.6%@150 • C), is chosen as the optimal sample to improve the blue and cyan compositions for full spectrum emission. Using the Ca 3.4 Lu 1.2 Hf 0.4 Ge 3 O 12 :Bi 3+ , commercial green (Ba, Sr) 2 SiO 4 :Eu 2+ phosphor, and commercial red CaAlSiN 3 :Eu 2+ phosphor on a 360-nm n-UV LED chip to fabricate WLED, which successfully bridge the cyan gap and the CRI value of the as-fabricated warm-white LED reaches 90.2. The previous results confirmed that CLHGO:Bi 3+ phosphors have promising application prospect in the development of n-UV-pumped warm-white LEDs with high-CRI values. The unique property performance originating from independent segregation structures provides more reference for the research on photoluminescence mechanism.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A tunable blue–cyan dual emission phosphor in Ca₄₋_xLu₂_xHf₁₋_xGe₃O₁₂:Bi³⁺ via forming segregation structure for WLEDs

et al. 2022

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“…They have been widely used in various fields such as lighting, display, communication, medical treatment, and biological applications. 1–4 At present, commercial w-LEDs are mainly packaged by a combination of blue chips (GaInN) and yellow phosphors (YAG:Ce 3+ /red-green sulfide phosphors) or blue chips (GaInN) and three-primary phosphors. However, this type of device practically results in a low rendering index and high color temperature due to the lack of red phosphor components, which makes it far from the best requirements in the mass market.…”

Section: Introductionmentioning

confidence: 99%

Preparation and wide band emission characteristics of Eu²⁺/Eu³⁺ co-doped Ba₃P₄O₁₃ phosphors

et al. 2022

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“…There are a number of different strategies to realize a white LED. The most common one is InGaN blue chips combined with YAG: Ce 3+ yellow phosphors, which shows high correlated color temperature (CCT > 4500 K) because of the deficiency of red component [5][6][7][8]. Another method is combined red, green and blue (RGB) phosphors with ultraviolet (UV) or near-ultraviolet (NUV) chips, which still has a problem that phosphors may have different degradation rates and the final color of light will change over time [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

Bi¹,

Jia²,

Liu³

et al. 2022

Journal of Renewable Materials

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A series of uniform single-phase spherical BaWO 4 : Dy 3+ , Tm 3+ , Eu 3+ phosphors were prepared via a microwave hydrothermal method by using trisodium citrate dehydrate as surfactant. The phase structure, morphology and photoluminescence properties were measured by powder X-ray diffraction, scanning electron microscope and fluorescence spectrometer, respectively. The results show that uniform spherical microcrystals with diameters in the range of 2-4 μm are obtained. And the phase and morphology of samples are not significantly changed by doping rare earth (RE 3+ ) ions. Under the excitation wavelength of 356 and 365 nm, the samples BaWO 4 : 0.03Dy 3+ , yTm 3+ can emit cold white light. In order to lower the correlated color temperature (CCT) to get a warm white light, the Eu 3+ ions were doped into BaWO 4 : 0.03Dy 3+ , 0.01Tm 3+ . Especially, under the excitation of 365 nm, BaWO 4 : 0.03Dy 3+ , 0.01Tm 3+ , 0.03Eu 3+ phosphor shew a bright warm white light with color coordinate of (0.4013, 0.3629) and CCT of 3288 K. Moreover, in the BaWO 4 : Dy 3+ , Tm 3+ , Eu 3+ phosphors, the energy transfer mechanism among Dy 3+ , Tm 3+ and Eu 3+ ions have been discussed and the change of electron structures have been calculated by first-principles calculations. The results shew that the uniform single-phase spherical BaWO 4 : Dy 3+ , Tm 3+ , Eu 3+ phosphors could be favorable candidates in warm white LEDs.

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A study of optical properties and site preference of Bi3+/Eu3+ co-doped CaLa4Si3O13 red-emitting phosphors for w-LED applications

Cited by 34 publications

References 50 publications

A tunable blue–cyan dual emission phosphor in Ca₄₋_xLu₂_xHf₁₋_xGe₃O₁₂:Bi³⁺ via forming segregation structure for WLEDs

A tunable blue–cyan dual emission phosphor in Ca₄₋_xLu₂_xHf₁₋_xGe₃O₁₂:Bi³⁺ via forming segregation structure for WLEDs

Preparation and wide band emission characteristics of Eu²⁺/Eu³⁺ co-doped Ba₃P₄O₁₃ phosphors

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

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A study of optical properties and site preference of Bi3+/Eu3+ co-doped CaLa4Si3O13 red-emitting phosphors for w-LED applications

Cited by 34 publications

References 50 publications

A tunable blue–cyan dual emission phosphor in Ca4−xLu2xHf1−xGe3O12:Bi3+ via forming segregation structure for WLEDs

A tunable blue–cyan dual emission phosphor in Ca4−xLu2xHf1−xGe3O12:Bi3+ via forming segregation structure for WLEDs

Preparation and wide band emission characteristics of Eu2+/Eu3+ co-doped Ba3P4O13 phosphors

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

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A tunable blue–cyan dual emission phosphor in Ca₄₋_xLu₂_xHf₁₋_xGe₃O₁₂:Bi³⁺ via forming segregation structure for WLEDs

A tunable blue–cyan dual emission phosphor in Ca₄₋_xLu₂_xHf₁₋_xGe₃O₁₂:Bi³⁺ via forming segregation structure for WLEDs

Preparation and wide band emission characteristics of Eu²⁺/Eu³⁺ co-doped Ba₃P₄O₁₃ phosphors