Preparation and luminescent properties of tunable polychromatic phosphors CaNaB5O9: RE3+(RE = Dy, Eu, Tb)

Zhao, Wenyu; Wen, Huixia; Fan, Bin; Li, Hong‐Xi; Hao, Mengyuan

doi:10.1016/j.optmat.2019.109274

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…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]. A more attractive approach is using a UV chip in conjunction with a single-phase phosphor that has multiple emitting centers to get warm-white light [13][14][15].…”

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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