A novel single-phased white light emitting phosphor of Eu3+ ions-doped Ca2LaTaO6

Tsai, Yeou-Yih; Shih, Hung-Rung; Tsai, Mu‐Tsun; Chang, Yee‐Shin

doi:10.1016/j.matchemphys.2013.09.040

Cited by 25 publications

(6 citation statements)

References 19 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: 71%

“…The present results were roughly the same with τ = 0.5 ms in Ca2LaTaO6:Eu 3+ , τ = 0.69 ms in Ca2LuTaO6:Eu 3+ and τ = 0.61 ms in Gd2ZnTiO6:Eu 3+ for Eu 3+ ions at A sites, and τ = 4.23 ms in Ba2MgWO6:Eu 3+ and τ = 3.55 ms in Ba2La2/3Te1/3O6:Eu 3+ for those at B sites. [22][23][24][25][26] The quantum efficiencies (η ) of the Eu 3+ PL were evaluated at RT for excitation via the CT peaks, namely, at 298 nm for CLTO:Eu 3+ and at 278 nm for BLTO:Eu 3+ , using all emission peaks in the visible region. The internal quantum efficiency (η in) and external quantum efficiency (η ex) for CLTO:Eu 3+ (x=0.10) were 8 and 5 %, respectively, which were lower than those for LaLuO3:Eu 3+ (A).…”

Section: Resultsmentioning

confidence: 99%

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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: 71%

Section: Resultsmentioning

confidence: 99%

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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“…These three new peaks originated from the 5 D 0,1,2 – 7 F J transition of Eu 3+ , and no Eu 2+ emission peak was observed. These meant that Eu 2+ in the synthesized L 4 Eu III 2 Eu II can sensitize Eu 3+ and increase the luminescence intensity of L 4 Eu III 2 Eu II . ,, The PL quantum yield of L 4 Eu III 2 Eu II was 10%, and this sensitization efficiency is higher than those reported in some literature studies. , …”

Section: Resultsmentioning

confidence: 69%

Rare Self-Luminous Mixed-Valence Eu-MOF with a Self-Enhanced Characteristic as a Near-Infrared Fluorescent ECL Probe for Nondestructive Immunodetection

et al. 2021

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Steady and efficient sensitized emission of Eu 2+ to Eu 3+ can be achieved through a rare mixed-valence Eu-MOF (L 4 Eu III 2 Eu II ). Compared with the sensitization of other substances, the similar ion radius and configuration of the extranuclear electron between Eu 2+ and Eu 3+ make sensitization easier and more efficient. The sensitization of Eu 2+ to Eu 3+ is of great assistance for the selfenhanced luminescence of L 4 Eu III 2 Eu II , the longer luminous time, and the more stable electrochemiluminescence (ECL) signal. Simultaneously, L 4 Eu III 2 Eu II possesses near-infrared (NIR) fluorescence of around 900 nm and a mighty selfluminous characteristic, which render it useful as a NIR fluorescent probe and as a luminophore to establish a NIR ECL biosensor. This NIR biosensor can greatly reduce the damage to the detected samples and even achieve a nondestructive test and improve the detection sensitivity by virtue of strong susceptibility and environmental suitability of NIR. In addition, the CeO 2 @Co 3 O 4 triple-shelled microspheres further enhanced the ECL intensity due to two redox pairs of Ce 3+ / Ce 4+ and Co 2+ /Co 3+ . The NIR ECL biosensor based on these strategies owns an ultrasensitive detection ability of CYFRA 21-1 with a low limit of detection of 1.70 fg/mL and also provides a novel idea for the construction of a highly effective nondestructive immunodetection biosensor.

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“…Unfortunately, this combination yields a low color-rendering index because there is no red-light-emitting component [7][8]. Recent advances in single-phased white light emitting phosphors, [9][10] have many applications for w-LEDs.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bi3+ Ion-Doped on the Microstructure and Photoluminescence of La0.97Pr0.03VO4 Phosphor

Chen

Shih

et al. 2021

Adv. technol. innov.

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The objective of this paper is to enhance the emission intensity of La0.97Pr0.03VO4 single-phased white light emitting phosphor. The Bi3+ ion-doped La0.97Pr0.03VO4 single-phased white light emitting phosphors are synthesized using a sol-gel method. The structure and photoluminescence properties of (La0.97-yBiy)Pr0.03VO4 (y = 0-0.05) phosphor are also examined. The XRD results show that the structure of La0.97Pr0.03VO4 phosphors with different concentrations of Bi3+ ion doping keeps the monoclinic structure. The SEM results show that the phosphor particles become smoother when the Bi3+ ion is doped. The excitation band for La0.97Pr0.03VO4 phosphor exhibits a blue shift from 320 nm to 308 nm as the Bi3+ ion contents are increased. The maximum emission intensity is achieved for a Bi3+ ion content of 0.5 mol%, which is about 30% greater than that with no Bi3+ ion doped. The CIE chromaticity coordinates are all located in the near white light region for different Bi3+ ion-doped La0.97Pr0.03VO4 phosphors.

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A novel single-phased white light emitting phosphor of Eu3+ ions-doped Ca2LaTaO6

Cited by 25 publications

References 19 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

Rare Self-Luminous Mixed-Valence Eu-MOF with a Self-Enhanced Characteristic as a Near-Infrared Fluorescent ECL Probe for Nondestructive Immunodetection

Effects of Bi3+ Ion-Doped on the Microstructure and Photoluminescence of La0.97Pr0.03VO4 Phosphor

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