Thermally stable double-perovskite Ca3TeO6:Eu3+ red-emitting phosphors with high color purity

Fan, Feiyue; Zhao, Lei; Shang, Yifan; Liu, Jing; Chen, Wenbo; Li, Yanyan

doi:10.1016/j.jlumin.2019.03.001

Cited by 101 publications

(8 citation statements)

References 40 publications

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“…The evaluation of the lifetimes was also carried out by the direct Eu 3+ excitation through 4f-4f transitions at 395 or 397 nm. The results were almost the same with those by the CT excitation, indicating the relaxation from the excited CT states (Eu 2+ states) to the excited Eu 3+ 5 D0 states is far much faster than the relaxation from the 5 D0 to Although the lifetimes of Eu 3+ PL in the double perovskite-type oxides have been reported in several papers, [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] Eu 3+ sites and the excitation wavelengths have not been examined systematically for the understanding of the site-dependent Eu 3+ luminescence. Therefore, it is limited to compare the lifetimes among the double perovskite-type oxides.…”

Section: Resultssupporting

confidence: 55%

Site-Dependent Eu3+ Photoluminescence in Double Perovskite-Type Alkaline Earth Lanthanum Tantalates

Ueda

Yoshino

Shimizu

et al. 2021

Journal of Luminescence

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Highlights 1. Phase-pure Eu 3+ doped Ca2LaTaO6 (CLTO) and Ba2LaTaO6 (BLTO) were prepared. 2. Eu 3+ were confirmed to be at A sites in CLTO and B sites in BLTO by XANES analysis. 3. Eu 3+ site-dependent PL spectra were obtained using the Eu 3+-site-confirmed samples. 4. Site-dependent PL and the lifetime were examined systematically by CT excitation. 5. High external efficiency of 28% was found in the Eu 3+ doped BLTO double perovskite.

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Section: Resultssupporting

confidence: 55%

Site-Dependent Eu3+ Photoluminescence in Double Perovskite-Type Alkaline Earth Lanthanum Tantalates

Ueda

Yoshino

Shimizu

et al. 2021

Journal of Luminescence

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“…Figure S2 displays the decay curves of Ce 3+ , and based on the Dexter’s and Reisfeld’s theories and decay curves, the dominant energy transfer mechanism from Ce 3+ to Mn 2+ was identified as a dipole–quadrupole interaction (as shown in Figure S3). − …”

Section: Resultsmentioning

confidence: 99%

MgGd₄Si₃O₁₃:Ce³⁺, Mn²⁺: A Dual-Excitation Temperature Sensor

et al. 2022

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A novel apatite-based phosphor MgGd 4 Si 3 O 13 [Mg 2 Gd 8 (SiO 4 ) 6 O 2 ]:Ce 3+ , Mn 2+ was designed and successfully synthesized by a solid-state reaction. Based on the different luminescence properties under 298 and 340 nm excitations, its potential application as a dual-excitation luminescent ratiometric thermometer was studied in detail. Under the excitations of 298 and 340 nm, the fluorescent intensity ratio of Ce 3+ and Mn 2+ is linearly correlated in the temperature range of 303–473 K. The sensitivity showed an opposite trend with the increase of temperature, and the maximum value was 0.95% K –1 . These results indicated that MgGd 4 Si 3 O 13 : Ce 3+ , Mn 2+ can be used as an ideal dual-excitation luminescent ratiometric thermometer.

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“…n-UV-pumped WLEDs have the potential for indoor general lighting because of high CRI (>80) and low CCT (<4000 K). 2,[29][30][31][32][33][34] However, there is a cyan gap (480-500 nm) in the emission spectrum of WLEDs for common commercial combinations, which puts a limitation on their CRI values. 2,12,35,36 Hence, once bridge the so-called cyan gap, the CRI values could be further improved.…”

Section: Introductionmentioning

confidence: 99%

“…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. n‐UV‐pumped WLEDs have the potential for indoor general lighting because of high CRI (>80) and low CCT (<4000 K) 2,29–34 . However, there is a cyan gap (480–500 nm) in the emission spectrum of WLEDs for common commercial combinations, which puts a limitation on their CRI values 2,12,35,36 .…”

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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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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Thermally stable double-perovskite Ca3TeO6:Eu3+ red-emitting phosphors with high color purity

Cited by 101 publications

References 40 publications

Site-Dependent Eu3+ Photoluminescence in Double Perovskite-Type Alkaline Earth Lanthanum Tantalates

Site-Dependent Eu3+ Photoluminescence in Double Perovskite-Type Alkaline Earth Lanthanum Tantalates

MgGd₄Si₃O₁₃:Ce³⁺, Mn²⁺: A Dual-Excitation Temperature Sensor

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

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Thermally stable double-perovskite Ca3TeO6:Eu3+ red-emitting phosphors with high color purity

Cited by 101 publications

References 40 publications

Site-Dependent Eu3+ Photoluminescence in Double Perovskite-Type Alkaline Earth Lanthanum Tantalates

Site-Dependent Eu3+ Photoluminescence in Double Perovskite-Type Alkaline Earth Lanthanum Tantalates

MgGd4Si3O13:Ce3+, Mn2+: A Dual-Excitation Temperature Sensor

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

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MgGd₄Si₃O₁₃:Ce³⁺, Mn²⁺: A Dual-Excitation Temperature Sensor

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