Synthesis and photoluminescence properties of a novel BaGe4O9:Eu3+ red emitting phosphor for warm white LEDs

Ji, Changyan; Zhi, Huang; Tian, Xiuying; Xie, Wei; Wen, Jin‐Kun; He, Hengping; Cai, Zhengdong; Zeng, Ting

doi:10.1016/j.dyepig.2018.09.012

Cited by 56 publications

(20 citation statements)

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“…All energy level transitions of Sm 3+ show high conformity with the diagram in Figure 7A. Under 406 nm excitation, the electrons absorb excited energy from the groundstate 6 H 5/2 level to the excited state level, then transferred to the 4 F 7/2 level. Subsequently, the electrons relaxed to the 4 G 5/2 level based on the non-radiation transition (NR) process.…”

Section: Optical Propertiessupporting

confidence: 63%

“…However, these products show high CCT and poor R a , owing to the lack of red composition. 5,6 These inevitable disadvantages greatly limit their application and popularization. An alternative way is developed using trichromatic (green, blue, and red) phosphors coated on the near-ultraviolet (n-UV) chips, which have recently received increasing attention.…”

mentioning

confidence: 99%

“…6 :Sm 3+ phosphor have very high heat resistance. Moreover, the luminescence intensity can keep 82% at 480 K of the original value at 300 K, which is superior than those reported phosphors in Table2.…”

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confidence: 99%

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Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

et al. 2021

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In this study, Sm 3+ -doped double-perovskite Mg 2 InSbO 6 phosphors were synthesized via high-temperature solid-state reaction. Mg 2 InSbO 6 belongs to the doubleperovskite family with a space group of R3 (No.148). The photoluminescence (PL) spectrum illustrates that Mg 2 InSbO 6 :0.05Sm 3+ phosphor can emit intense orange-red emission light at 607 nm due to the 4 G 5/2 → 6 H 7/2 transition. The optimum concentration of Mg 2 InSbO 6 :xSm 3+ is confirmed to 0.05 mol. The asymmetric ratio ( 4 G 5/2 → 6 H 9/2 / 4 G 5/2 → 6 H 5/2 ) of Mg 2 InSbO 6 :0.05Sm 3+ phosphor is 2.73. The quenching temperature exceeds 500 K, illustrating that Mg 2 InSbO 6 :Sm 3+ sample has excellent heat resistance. The high color purity and correlated color temperature (CCT) of Mg 2 InSbO 6 :Sm 3+ phosphors are obtained. Furthermore, a white light-emitting diode (w-LED) is successfully fabricated, possessing CCT of 6769 K and high color rendering index (R a ) of 89. Therefore, the orange-red-emitting Mg 2 InSbO 6 :Sm 3+ phosphors exhibit great potential to apply in solid-state lighting fields. K E Y W O R D S LED, luminescence, Mg 2 InSbO 6 :Sm 3+ , phosphor | 5967 LIU et aL. | INTRODUCTIONw-LEDs show a high potential application in displays and lighting. In addition, w-LEDs are replacing conventional solid-state lighting sources (fluorescent, incandescent, and metal-halide lamps), which are based on admirable merits, like high efficiency, energy conservation, long lifetimes, and eco-friendliness. [1][2][3][4] Currently, the method to fabricate commercial w-LEDs is a combination of yellow phosphor Y 3 Al 5 O 12 :Ce 3+ (YAG) and a blue LED chip. However, these products show high CCT and poor R a , owing to the lack of red composition. 5,6 These inevitable disadvantages greatly limit their application and popularization. An alternative way is developed using trichromatic (green, blue, and red) phosphors coated on the near-ultraviolet (n-UV) chips, which have recently received increasing attention. 7 Nitride is regarded as an excellent red phosphor like SrLiAl 3 N 4 :Ce 3+ , Sr 2 [BeAl 3 N 5 ]:Eu 2+ , and CaAlSiN 3 :Eu 2+ . 8-10 However, the synthesis condition (high temperature and high pressure) is strict. 11,12 Hence, exploring new orange-red-emitting or redemitting phosphors with good luminescence properties is extremely urgent. 13 Sm 3+ with 4f 5 electronic configuration is an important activator ion among the lanthanoid ions. [14][15][16] Sm 3+ usually exhibits orange-red or red emission in the visible region while excited by n-UV or blue light, which attributes to the 4 G 5/2 → 6 H 7/2 or 4 G 5/2 → 6 H 9/2 transitions, respectively. 17,18

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Section: Optical Propertiessupporting

confidence: 63%

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confidence: 99%

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Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

et al. 2021

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“…9 shows the PL spectra of BaWO 4 : 0.03Dy 3+ , Tm 3+ , zEu 3+ (z = 0.01, 0.02, 0.03, 0.04 and 0.05) phosphors excited at 356 and 365 nm, respectively. The emission peak at 612 nm is attributed to the transition 5 D 0 → 7 F 2 of Eu 3+ [43]. The emission intensities peak at 451 nm (Tm 3+ ), 571 nm (Dy 3+ ) and 612 nm (Eu 3+ ) with change of the concentration of Eu 3+ ions are shown in inset of Figs.…”

Section: Luminescence Propertiesmentioning

confidence: 88%

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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“…[15][16][17][18] Eu 3+ doped phosphors can emit red light at 615 nm and deep-red light at 705 nm due to the 5 D 0 -7 F 2 transition and 5 D 0 -7 F 4 transition of Eu 3+ , respectively. However, the deep-red emission of Eu 3+ is weaker 19,20 due to the forbidden transition, limiting its application in indoor plant cultivation. The emission light of Mn 4+ -activated oxides is mainly between 650-690 nm and only a small part of the Mn 4+ -activated oxides emits deep-red light.…”

Section: Introductionmentioning

confidence: 99%

Defect modulation and luminescence improvement of Mn⁴⁺-activated La(Mg, Nb)O₃ phosphor with improved stability for plant cultivation

Liu

Chen

et al. 2022

J. Mater. Chem. C

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Synthesis and photoluminescence properties of a novel BaGe4O9:Eu3+ red emitting phosphor for warm white LEDs

Cited by 56 publications

References 50 publications

Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

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

Defect modulation and luminescence improvement of Mn⁴⁺-activated La(Mg, Nb)O₃ phosphor with improved stability for plant cultivation

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Synthesis and photoluminescence properties of a novel BaGe4O9:Eu3+ red emitting phosphor for warm white LEDs

Cited by 56 publications

References 50 publications

Novel double‐perovskite Mg2InSbO6:Sm3+ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Novel double‐perovskite Mg2InSbO6:Sm3+ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

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

Defect modulation and luminescence improvement of Mn4+-activated La(Mg, Nb)O3 phosphor with improved stability for plant cultivation

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Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Defect modulation and luminescence improvement of Mn⁴⁺-activated La(Mg, Nb)O₃ phosphor with improved stability for plant cultivation