Luminescence properties of Eu(II)-borates and Eu2+- activated Sr-Borates

Machida, Ken‐ichi; Adachi, Gin‐ya; Shiokawa, Jiro

doi:10.1016/0022-2313(79)90038-3

Cited by 101 publications

(59 citation statements)

References 16 publications

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“…For most borates the emission has low intensity at 300 K. However, a high e$ciency has been reported for the UV emission of SrB O : Eu at 368 nm [1]. In most aluminates the emission of Eu> lies in the visible range.…”

Section: Introductionmentioning

confidence: 98%

Crystal Structure of SrAl2B2O7 and Eu2+ Luminescence

Lucas

Jaulmes

Quarton

et al. 2000

Journal of Solid State Chemistry

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Section: Introductionmentioning

confidence: 98%

Crystal Structure of SrAl2B2O7 and Eu2+ Luminescence

Lucas

Jaulmes

Quarton

et al. 2000

Journal of Solid State Chemistry

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“…The intensity (I) of intracenter transitions 7 F 0 → 5 D 1-4 , 5 L 6 in Eu 3+ ions proved to be considerably lower. In the interval T = 10-293 K, the nature of the excitation spectra, including the position of the maximum for the charge transfer band, does not change for the most intense luminescence bands for Eu 3+ (the transition 5 D 0 → 7 F 2 ). In [12], based on analysis of the excitation spectra, the quantum efficiency (η) was calculated for luminescence of Eu 3+ in some strontium borates for excitation in the charge transfer band region.…”

mentioning

confidence: 95%

“…This is why a detailed study of their optical and luminescent properties is needed. Luminescence of lanthanide (Ln) ions (Ce 3+ , Sm 3+ , Eu 2+ , Tb 3+ ) in strontium hexaborate SrB 6 O 10 when excited in the 240-400 nm region has been studied in [5][6][7][8][9]. We know [6] that two types of Ce 3+ centers are present in solid solutions of composition Sr 1-x Ce x B 6 O 10 (x ≤ 0.01) obtained in an inert medium (N 2 ).…”

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confidence: 99%

Luminescence of europium and ytterbium ions in strontium hexaborate

et al. 2006

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We have studied the luminescent properties of Eu 2+/3+ and Yb 2+ ions in strontium hexaborate SrB 6 O 10 for excitation in the 120-400 nm region. The luminescence spectra of Ln 2+ ions in SrB 6 O 10 consist of overlapping bands in the 370-520 nm region, due to 5d → 4f transitions at several nonequivalent centers. In the excitation spectra, besides the bands associated with 4f → 5d transitions in the Ln 2+ ions, we also observe a band in the 135-160 nm region due to the transitions O(2p) → B(2s,2p) within the borate anions. The luminescence of the Eu 3+ ions is excited most efficiently in the region of the Eu 3+ charge transfer band (λ max = 226 nm). The results obtained are compared with data for Ln in other strontium borates.Introduction. Alkaline earth borates and solid solutions based on them are widely used as nonlinear optical crystals for obtaining coherent radiation in the UV region of the spectrum [1, 2], and also as luminophores for various purposes [3,4]. This is why a detailed study of their optical and luminescent properties is needed. Luminescence of lanthanide (Ln) ions (Ce 3+ , Sm 3+ , Eu 2+ , Tb 3+ ) in strontium hexaborate SrB 6 O 10 when excited in the 240-400 nm region has been studied in [5][6][7][8][9]. We know [6] that two types of Ce 3+ centers are present in solid solutions of composition Sr 1-x Ce x B 6 O 10 (x ≤ 0.01) obtained in an inert medium (N 2 ). One type of center is formed by direct substitution of strontium ions Sr 2+ with no local charge compensation, while the second type of center is an associate of a Ce 3+ cerium ion and a cationic (Sr) vacancy. The crystal structure of SrB 6 O 10 has not been deciphered in detail, but luminescence and EXAFS (Extended X-ray Absorption Fine Structure) spectroscopy have established the presence in the structure of an Sr position characterized by a high coordination number (N = 9), a comparatively long Sr-O distance (R Sr-O ≥ 2.7 Å), and low point symmetry [6,7]. Efficient Ce 3+ → Tb 3+ energy transfer has been observed in strontium hexaborate, which allowed the authors of [8] to recommend a composition with formula Sr 0.68 Ce 0.08 Tb 0.08 Na 0.16 B 6 O 10 for use in lighting devices as a photoluminophore. The luminescence spectrum of Eu 2+ ions in SrB 6 O 10 for UV excitation consists of three bands with maxima at 390 nm, 435 nm, and 470 nm, which are assigned to 4f 6 5d → 4f 7 transitions in Eu 2+ ions occupying three nonequivalent positions [9]. The excitation and luminescence spectra of Eu 3+ ions in SrB 6 O 10 at 293 K are shown in [10], but the nature of the impurity luminescence centers was not analyzed because fine structure did not appear in the spectra at room temperature.In this paper, we present the results of a more detailed study of the luminescent properties of Eu 2+ /Eu 3+ ions in SrB 6 O 10 for optical and synchrotron excitation in the 120-340 nm region. Note that the results obtained for Eu 3+ ions are considerably different from the data in [10]. Data on the luminescent properties of Yb 2+ ions in SrB 6 O 10 are presented he...

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“…The luminescence properties of Eu 2+ ions activated materials have been investigated for a long time as efficient blue or green emission in many kinds of commercial phosphors [6][7].…”

Section: Introductionmentioning

confidence: 99%

Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

Reddy

Kokila

Nagabhushana

et al. 2014

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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ZnO:Eu (0.1 mol%) nanopowders have been synthesized by auto ignition based low temperature solution combustion method. Powder X-ray diffraction (PXRD) patterns confirm the nano sized particles which exhibit hexagonal wurtzite structure. The crystallite size estimated from Scherrer's formula was found to be in the range ~ 35-39 nm. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) studies reveal particles are agglomerated with quasi-hexagonal morphology. A blue shift of absorption edge with increase in band gap is observed for Eu doped ZnO samples.Upon 254 nm excitation, ZnO:Eunanopowders show peaks in regions blue (420-484 nm), green (528 nm) and red (600 nm) which corresponds to both Eu 2+ and Eu 3+ ions. The Electron paramagnetic resonance (EPR) spectrum exhibits a broad resonance signal at g = 4.195 which is attributed to Eu 2+ ions. Further, EPR and thermoluminescence (TL) studies reveal presence of native defects in this phosphor. Using TL glow peaks the trap parameters have been evaluated and discussed.

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Luminescence properties of Eu(II)-borates and Eu2+- activated Sr-Borates

Cited by 101 publications

References 16 publications

Crystal Structure of SrAl2B2O7 and Eu2+ Luminescence

Crystal Structure of SrAl2B2O7 and Eu2+ Luminescence

Luminescence of europium and ytterbium ions in strontium hexaborate

Luminescence studies and EPR investigation of solution combustion derived Eu doped ZnO

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