Luminescence enhancement of Al3+ co-doped Ca3Sr3(VO4)4:Eu3+ red-emitting phosphors for white LEDs

Wu, Yangting; Qiu, Kehui; Tang, Qingfeng; Zhang, Wentao; Wang, Junlan

doi:10.1016/j.ceramint.2018.01.267

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…The color purity of as-synthesized Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 phosphors is an essential factor for WLEDs application. Therefore the color purity can be calculated through the following expression: 63 here, ( x , y ) stands for the CIE coordinates of Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 phosphors, ( x i , y i ) denotes the color coordinates of white illumination and ( x d , y d ) represents the coordinates of dominant wavelength, respectively. In the present work, the coordinates were evaluated to be ( x = 0.643, y = 0.356), ( x i = 0.310, y i = 0.316) and ( x d = 0.651, y d = 0.353).…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence properties of novel Ba₂Lu₅B₅O₁₇:Eu³⁺ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

et al. 2018

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A series of new red-emitting Ba 2 Lu 4.98Àx Eu x La 0.02 B 5 O 17 (0.1 # x # 1.0) phosphors were synthesized via the high-temperature solid-state reaction method. The phase formation of the as-synthesized Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 phosphor was confirmed by powder X-ray diffraction analysis. It was found that La 3+ doping resulted in the reduction of LuBO 3 impurities and thus pure phase Ba 2 Lu 5 B 5 O 17 was realised. The morphology of Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 phosphors was studied by field emission scanning electron microscopy (FE-SEM). As a function of Eu 3+ concentration the photoluminescence spectra and decay lifetimes were investigated in detail. Under excitation at 396 nm, a dominant red emission peak located at 616 nm ( 5 D 0 / 7 F 2 ) indicated that Eu 3+ ions mainly occupied low symmetry sites with a noninversion center in Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 . The optimal Eu 3+ ion concentration was found to be x ¼ 0.5 and the critical distance of Eu 3+ was determined to be 6.55Å. In addition, the concentration quenching takes place via dipole-dipole interactions. The phosphors exhibited good CIE (Commission International de I'Eclairage) color coordinates (x ¼ 0.643, y ¼ 0.356) situated in the red region and a high color purity of 97.8%. Furthermore, the internal quantum efficiency and the thermal stability of Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 phosphors were also investigated systematically. The results suggest that Ba 2 Lu 4.48 Eu 0.5 La 0.02 B 5 O 17 may be a potential red phosphor for white light-emitting diodes.

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Section: Resultsmentioning

confidence: 99%

Photoluminescence properties of novel Ba₂Lu₅B₅O₁₇:Eu³⁺ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

et al. 2018

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“…The, R c was determined to be 6.52 Å suggesting multipole‐multipole interaction leading to concentration quenching in the present case . The color perception as stated by the chromaticity coordinates was lying in the red region (Figure B and Table ) . The color purity of Eu 3+ ( x = 0.10) member was determined by applying the following equation and found out to be 67%

Color Purity = \frac{\sqrt{{(x - x_{normali})}^{2} + {(y - y_{normali})}^{2}}}{\sqrt{{(x_{normald} - x_{normali})}^{2} + {(y_{normald} - y_{normali})}^{2}}} \times 100 %

where ( x , y ) ‐coordinates of a sample point, ( x i , y i ) ‐coordinates of the illuminants (0.3130, 0.3300), and ( x d , y d ) ‐coordinates of the dominant wavelength of 612 nm (0.6080, 0.3888) of the sample.…”

Section: Resultsmentioning

confidence: 69%

“…45 The color perception as stated by the chromaticity coordinates was lying in the red region ( Figure 7B and Table S2). 46 The color purity of Eu 3+ (x = 0.10) member was determined by applying the following equation and found out to be 67%…”

Section: Resultsmentioning

confidence: 99%

Luminescence properties of Eu³⁺‐ and Tb³⁺‐doped δ‐Bi₂O₃ stabilized by Th⁴⁺ substitution

et al. 2019

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The extent of incorporating Eu3+ and Tb3+ for bismuth in the oxygen‐deficient fluorite structured Bi0.50Th0.50Oy has been examined together with the comprehension of their luminescence characteristics. The samples were synthesized by solution combustion method from which doping limits of Eu3+ and Tb3+, respectively, in the fluorite structure was determined. Uniform distribution of constituent elements was confirmed from elemental mapping. Doping Eu3+ and Tb3+‐ions introduced compressive strain and oxygen vacancies in the system. Raman spectra of doped samples confirmed the fluorite structure and revealed the existence of oxygen vacancies in them. While Tb‐doped samples showed a systematic decrease in band gap with increase in dopant concentration, such systematic variation was not observed for Eu‐doped samples. Conclusions about the local site symmetry around Eu3+ and Tb3+ ions in the defect fluorite structure have been drawn from the photoluminescent spectral analysis of doped samples. Energy transfer from Bi3+ to Eu3+ and Tb3+‐has been observed in these samples. The Judd‐Ofelt analysis has been carried out to understand luminescence characteristics in these samples.

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“…A variation in the cell volume may have caused the observed 2θ shift. Typically, an increase in the Al 3+ concentration decreases the cell volume because a smaller Al 3+ (0.051 nm) displaces the larger Cr 3+ (0.061 nm) ions (Liu et al, 2015;Wu et al, 2018). Supplementary Tables S1, S2 show that there is no obvious change in cell volume with the increase in Mg concentration in CoCr 2 O 4 , which is mainly due to the similar ionic radii of Mg 2+ and Co 2+ .…”

Section: Powder X-ray Diffraction Analysismentioning

confidence: 98%

Synthesis and Characterisation of Mg2+ and Al3+ Co-Doped CoCr2O4 Inorganic Pigments With High Near-Infrared Reflectance

et al. 2022

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A new class of near-infrared (NIR) reflectance pigments based on Co1−xMgxCr2−yAlyO4 (x = 0–1 and y = 0–2) was synthesised using the Pechini-type sol-gel process. The developed powders were characterised by thermogravimetry and differential scanning calorimetry, X-ray diffraction (XRD), ultraviolet–visible near-infrared diffuse reflectance spectroscopy, and colour Commission Internationale del'Eclairage (CIE) 1976 (L*a*b*) colour scales. The XRD patterns revealed characteristic peaks of the spinel structure with good crystallinity. Substituting Mg2+ for Co2+ ions in the tetrahedral positions and Al3+ for Cr3+ ions in the octahedral positions of CoCr2O4 reduces the cost and changes the colour of the pigment (green to yellow and then blue). Moreover, the synthesised pigments exhibited high NIR solar reflectance in the 780–2,500 nm wavelength range. The thermal and chemical stability of the pigments was also studied. Our findings demonstrate the potential for applying these pigments in cool colourants.

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Luminescence enhancement of Al3+ co-doped Ca3Sr3(VO4)4:Eu3+ red-emitting phosphors for white LEDs

Cited by 18 publications

References 25 publications

Photoluminescence properties of novel Ba₂Lu₅B₅O₁₇:Eu³⁺ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

Photoluminescence properties of novel Ba₂Lu₅B₅O₁₇:Eu³⁺ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

Luminescence properties of Eu³⁺‐ and Tb³⁺‐doped δ‐Bi₂O₃ stabilized by Th⁴⁺ substitution

Synthesis and Characterisation of Mg2+ and Al3+ Co-Doped CoCr2O4 Inorganic Pigments With High Near-Infrared Reflectance

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Luminescence enhancement of Al3+ co-doped Ca3Sr3(VO4)4:Eu3+ red-emitting phosphors for white LEDs

Cited by 18 publications

References 25 publications

Photoluminescence properties of novel Ba2Lu5B5O17:Eu3+ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

Photoluminescence properties of novel Ba2Lu5B5O17:Eu3+ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

Luminescence properties of Eu3+‐ and Tb3+‐doped δ‐Bi2O3 stabilized by Th4+ substitution

Synthesis and Characterisation of Mg2+ and Al3+ Co-Doped CoCr2O4 Inorganic Pigments With High Near-Infrared Reflectance

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Photoluminescence properties of novel Ba₂Lu₅B₅O₁₇:Eu³⁺ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

Photoluminescence properties of novel Ba₂Lu₅B₅O₁₇:Eu³⁺ red emitting phosphors with high color purity for near-UV excited white light emitting diodes

Luminescence properties of Eu³⁺‐ and Tb³⁺‐doped δ‐Bi₂O₃ stabilized by Th⁴⁺ substitution