VUV sensitisation of Eu3+ emission by Tb3+ in Ba3Tb(PO4)3–Eu

Mikhailik, V.B.; Kraus, H.

doi:10.1016/j.jlumin.2009.04.002

Cited by 23 publications

(24 citation statements)

References 17 publications

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“…However, it is seen that the character of the emission spectra of Eu 3+ depends significantly on the luminescence excitation wavelength (l exc ). The luminescence spectrum at l exc = 260 nm is similar to the spectra of Eu 3+ -activated phosphates with structures of the eulitine type [6,8,[12][13][14]. It is characterized by a strong nonelementary band in the region of 607-624 nm with a local maximum at 611 nm due to 5 D 0 ® 7 F 2 transitions in the Eu 3+ ions.…”

Section: Resultsmentioning

confidence: 61%

“…It is seen that the spectrum of the Tb 3+ ions (Fig. 2b, curve 1) contains a broad band with a maximum at 256 nm, corresponding to the spin-forbidden 4f 8 ®4f 7 5d transition, and a series of bands in the region of 300-500 nm due to the 7 F j ® 5 D 3,4 transitions in the Tb 3+ ions [6,15]. In addition to this the spectra contain a band at 240 nm due probably to the spin-permitted 4f 8 ®4f 7 5d transition in the Tb 3+ ions.…”

Section: Resultsmentioning

confidence: 98%

“…In addition to this the spectra contain a band at 240 nm due probably to the spin-permitted 4f 8 ®4f 7 5d transition in the Tb 3+ ions. In [5,6] a band, interpreted as the spin-permitted 4f 8 ®4f 7 5d transition in the Tb 3+ ions, was recorded at 232 nm in the luminescence excitation spectra of Ba 3 Tb(PO 4 ) 3 and Ba 3 Gd 0.5 Tb 0.1 La 0.4 (PO 4 ) 3 . The shift of the maximum of this band to 240 nm that we observed is probably due to the spectral limitations of the spectrofluorimeter used in the present work.…”

Section: Resultsmentioning

confidence: 99%

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Structure and Luminescent Characteristics of Ba3Tb(PO4)3 Doped with Eu3+ Ions

et al. 2015

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Tb, Ba). From study of the excitation spectra and the kinetics of luminescence quenching it was concluded that energy is transferred effectively from the Tb 3+ to the Eu 3+ during excitation in the UV and visible regions of the spectrum. Key words: mixed barium-terbium phosphate, Eu 3+ ions, eulitine, luminescent material. In recent years mixed phosphates with the composition M 3 II Ln(PO 4 ) 3 , with M II = Sr 2+ , Ba 2+ and Ln = Y 3+ , Cd 3+ , Tb 3+ , which crystallize in structures of the eulitine type (Bi 4 Si 3 O 12 ), have attracted increased attention on account of their use as the basis of luminophores for white light-emitting diodes [1-4] and plasma display panels [5]. Interest in the material with the composition Ba 3 Tb(PO 4 ) 3 : Eu 3+ arose from the possibility of increasing the luminescence intensity of the Eu 3+ as a result of the sensitizing effect of the Tb 3+ ions [6]. It was shown that the luminescence intensity of the Eu 3+ ions in Ba 3 Tb(PO 4 ) 3 during excitation in the ultraviolet region under vacuum is substantially higher than in Ba 3 Gd(PO 4 ) 3 . In the authors' opinion this is due to more effective energy transfer from Tb 3+ to Eu 3+ than from Gd 3+ to Eu 3+ . It should be noted that in [6] the luminescent characteristics of Eu 3+ in Ba 3 Tb(PO 4 ) 3 were only studied during excitation of luminescence in the vacuum ultraviolet region, which does not make it possible to reach a conclusion about the amount and the microstructure of the Eu 3+ luminescent centers. It is, however, known that compounds with structures of the eulitine type are characterized both by cationic [7] and by anionic (oxygen) disorder. The significant nonuniform broadening of the luminescence bands of the Eu 3+ , Eu 2+ , and Ce 3+ ions in the series of phosphates with the (Ba,Sr) 3 Ln(PO 4 ) 3 composition, where Ln = La 3+ , Eu 3+ , and Lu 3+ , have been linked to these crystal-chemical characteristics [8-10]. On the basis of the similarity in the luminescence spectra of Ce 3+ in a series of compounds with structures of the eulitine type the authors [10] came to the conclusion that the Ce 3+ ions in such structurally ordered systems can even form their own oxygen environment. The authors of [11] undertook a detailed X-ray structural investigation of Ba 3 Tb(PO 4 ) 3 single crystals grown by spontaneous crystallization and by the Czochralski method. It was shown that the Ba and Tb atoms in the Ba 3 Tb(PO 4 ) 3 structure occupy octahedral positions (16c) with distinctly different M-O 0040-5760/15/5103-0191

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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Structure and Luminescent Characteristics of Ba3Tb(PO4)3 Doped with Eu3+ Ions

et al. 2015

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“…The second band from 180 to 300 nm could be assigned to the f-d transitions of Tb 3 + . As is well known, interconfigurational (4f n À 1 5d-4f n ) radiative transitions of trivalent lanthanide ions have been demonstrated in various host crystals [14][15][16][17]; undoubtedly in GdTaO 4 , the 4f 8 -4f 7 5d 1 transitions of Tb 3 + can also play a great role [10]. Generally, when one electron of Tb 3 + is promoted from the ground state 4f 8 to the 4f 7 5d 1 excited states, it can produce two kinds of 4f 8 -4f 7 5d 1 transitions: spin-allowed and spin-forbidden transitions.…”

Section: Resultsmentioning

confidence: 88%

Luminescent properties of Tb3+ activated GdTaO4 with M and M′ type structure under UV–VUV excitation

Zhang

Wang

Xie

2010

Journal of Luminescence

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“…The lifetime was fitted to be 89 ns. Until recently, many phosphates doped by lanthanide ions have been reported to the development of new and efficient VUV-excited PDP phosphors, for example, RE-activated lanthanide phosphates REPO 4 (RE = La, Y, Gd, Tb) [24,37,38], alkaline-earth metal lanthanide phosphates M 3 RE(PO 4 ) 3 (M = Ca, Sr, Ba, RE = La, Y, Gd, Tb) [39], alkaline lanthanide phosphates AREP 2 O 7 (A = Na, K, Rb, Cs; RE = Y, Lu) [40]. Compared with the presently reported VUV phosphors, RE-doped Na 2 CaMg(PO 4 ) 2 phosphors have some advantages such as easy preparation, low preparation cost and high efficiency at the wavelength of the PDP excitation source.…”

Section: Resultsmentioning

confidence: 99%