Luminescence properties and crystallographic sites for Eu3+ ions in fluorthalenite Y3Si3O10F

Jang, Kyoung Hyuk; Хайдуков, Н. М.; Tuyen, Vu Phi; Kim, Sun Il; Yu, Young Moon; Seo, Hyo Jin

doi:10.1016/j.jallcom.2012.05.010

Cited by 20 publications

(7 citation statements)

References 26 publications

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“…9B). A thermal induced blue-shift of the 5 D 0 -7 F 0 transition was previously reported in other Ln 3 þ -based materials, from which we highlight the examples containing Eu 3 þ [33][34][35][36][37][38][39][40]. Selected ΔE 0 examples are overlapped with the value found for [Eu(keto) 3 (H 2 O)] in Fig.…”

Section: Temperature Dependence Of the 5 D 0 -7 F 0 Transitionsupporting

confidence: 52%

Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron–phonon coupling

Lahoud

Frem

Gálico

et al. 2016

Journal of Luminescence

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Lanthanide-based coordination compounds of molecular formula [Ln(keto) 3 (H 2 O)], where Ln¼ Gd, Eu and keto¼ ketoprofen, were synthesized and their photoluminescence features were detailed in the 12-300 K interval. The emission spectra of [Eu(keto) 3 (H 2 O)] reveal a strong dependence with the temperature, well-illustrated by an unusual large blue-shift (∼17 cm À 1) of the 5 D 0-7 F 0 transition as the temperature is raised. The arithmetic difference between the absorption spectrum of [Eu(keto) 3 (H 2 O)] with that of [Gd(keto) 3 (H 2 O)] pointed out the presence of a ligand-to-metal charge transfer (LMCT) band (320-370 nm). From the [Gd(keto) 3 (H 2 O)] phosphorescence the energy of the keto-related triplet states was determined showing a large overlap with the intra-4f 6 levels and a strong electron-phonon coupling. The high-resonance between the LMCT and triplet states and the Eu 3 þ levels leads to a strong dependence of the 5 D 0 lifetime value, typical of the presence of operative energy transfer processes.

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Section: Temperature Dependence Of the 5 D 0 -7 F 0 Transitionsupporting

confidence: 52%

Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron–phonon coupling

Lahoud

Frem

Gálico

et al. 2016

Journal of Luminescence

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“…occupies an inversion center site and the magnetic dipole transition 5 D 0 ? 7 F 1 is the dominant transition [32][33][34][35].…”

Section: Photoluminescence Characteristicsmentioning

confidence: 99%

Uniform KCaY(PO4)2:Eu3+ phosphors: sol–gel method, morphology and luminescence properties

Liang

Zhang

et al. 2015

J Mater Sci: Mater Electron

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Eu 3? doped KCaY(PO 4 ) 2 (KCYP) phosphors with irregular, hemispherical and spherical morphologies are successfully synthesized via a sol-gel method. The crystalline structure, morphology and luminescence properties of these phosphors are characterized by powder X-ray diffraction, scanning electron microscopy and photoluminescence spectroscopy. Under the excitation wavelength of near-ultraviolet (n-UV) 392 nm, the as-prepared KCYP:0.03Eu 3? phosphor exhibits an intense orange-red emission at 588 nm corresponding to 5 D 0 ? 7 F 1 transition of Eu 3? . The effect of synthesis conditions such as the dose of citric acid and pH of the precursor solution on the morphology and luminescence intensity of the phosphors is discussed in detail. The morphologies of KCYP:0.03Eu 3? phosphors vary from a small amount of spheres to aggregated hemispheres and then to smooth spheres by increasing the molar ratio of citric acid to metal ions in the host. The highest emission intensity can be obtained at the molar ratio of citric acid to metal ions 2:1 and pH = 8.0, respectively.

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“…큰 차이점 중의 하나는 LED 작동 온도 (~120 o C)에서 장시간 열적 안정성이 뛰어나야 하고 형광 의 열소멸이 최소화되어야 한다. LED 용 형광체로서의 요건을 갖춘 형광물질을 찾기 위하여 단순 산화물(예를 들면 Y 2 O 3 , Gd 2 O 3 등)과는 특성이 다른 산소산염계 물 질, 즉, 인산염계, 3,4) 텅스텐산염계, 5) 붕산염계, 6) 몰리브덴 산염계, 7) 실리콘산염계, 8,9) 바나데이트산염계 10,11) ) 형 광체는 물질에 따라 모체 자체의 엑시톤 흡수 및 방출 밴드가 존재하는 경우가 많아 이를 이용한 형광 효율 향 상이 가능할 뿐만 아니라 우수한 화학적 안정성을 가지 고 있다. 1,2,12,13) 잘 알려진 텅스텐산 모체 물질은 AWO 4 (A = 2가 알칼리 토류 금속) [13][14][15][16][17][18][19] 이며 이미 많은 연구가 보고 되었지만 최근에는 복잡한 조성의 텅스텐산염계 형광체의 연구도 이루어 지고 있다.…”

Section: 서 론unclassified

Synthesis and Luminescence Properties of Tb3+-Doped K2BaW2O8 Phosphors

장¹,

서²,

구³

et al. 2012

Korean. J. Mater. Res.

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Green phosphors K 2 BaW 2 O 8 :Tb 3+ (1.0 mol%) were synthesized by solid state reaction method. Differential thermal analysis was applied to trace the reaction processes. Three endothermic values of 95, 706, and 1055 o C correspond to the loss of absorbed water, the release of carbon dioxide, and the beginning of the melting point, respectively. The phase purity of the powders was examined using powder X-ray diffraction(XRD). Two strong excitation bands in the wavelength region of 200-310 nm were found to be due to the WO 4 2− exciton transition and the 4f-5d transition of Tb 3+ in K 2 BaW 2 O 8. The excitation spectrum presents several lines in the range of 310-380 nm; these are assigned to the 4f-4f transitions of the Tb 3+ ion. The strong emission line at around 550 nm, due to the 5 D 4 → 7 F 5 transition, is observed together with weak lines of the 5 D 4 → 7 F J (J = 3, 4, and 6) transitions. A broad emission band peaking at 530 nm is observed at 10 K, while it disappears at room temperature. The decay times of Tb 3+ 5 D 4 → 7 F 5 emission are estimated to be 4.8 and 1.4 ms, respectively, at 10 and 295 K; those of the WO 4 2− exciton emissions are 22 and 0.92 µs at 10 and 200 K, respectively.

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Luminescence properties and crystallographic sites for Eu3+ ions in fluorthalenite Y3Si3O10F

Cited by 20 publications

References 26 publications

Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron–phonon coupling

Intriguing light-emission features of ketoprofen-based Eu(III) adduct due to a strong electron–phonon coupling

Uniform KCaY(PO4)2:Eu3+ phosphors: sol–gel method, morphology and luminescence properties

Synthesis and Luminescence Properties of Tb3+-Doped K2BaW2O8 Phosphors

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