Bright green-emitting, energy transfer and quantum cutting of Ba_3Ln(PO_4)_3: Tb^3+ (Ln = La, Gd) under VUV-UV excitation

Hou, Dan; Liang, H.; Xie, Mubiao; Ding, Xuemei; Zhong, Jiuping; Su, Qiang; Ye, Tao; Huang, Yan; Gao, Zhenhua

doi:10.1364/oe.19.011071

Cited by 67 publications

(35 citation statements)

References 19 publications

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“…2a. The spectrum of Ba 3 Tb(PO 4 ) 3 agrees with published data [5] and consists of a series of bands at 485-495, 540-547, 580-591, and 621 nm corresponding to the 5 D 4 ® 7 F j transitions in the Tb 3+ ions. It should be noted that bands corresponding to the 5 D 3 ® 7 F j transitions in the Tb 3+ ions are absent.…”

Section: Resultssupporting

confidence: 85%

“…This fact explains the cross-relaxation processes that is characteristic of systems with a high concentration of Tb 3+ . The cross-relaxation processes are described by the following scheme: ( 5 D 3 ® 5 D 4 ) : ( 7 F 6 ® 7 F 0 ) [5].…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…The authors of [5] synthesized polycrystalline Ba 3 Tb(PO 4 ) 3 by solid-phase reactions at a relatively high temperature (1200°C). The main disadvantages of this method are the comparatively large size of the particles and the low homogeneity of the final product.…”

Section: Methodsmentioning

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: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

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 3+ doping phosphors have been widely researched, such as Ba 9 Lu 2 Si 6 O 24 :Tb 3+ , 9 Ca 9 Ln(PO 4 ) 7 :Tb 3+ (Ln=Y, La, Gd), 10 BaY 2 Si 3 O 10 :Ce 3+ /Eu 3+ /Tb 3+ . 11 While, CRET process is not just dependent on the Tb 3+ concentration from the previous reports, [12][13][14] the crystal structure and composition of hosts are also important factors affecting the CRET process. Eu 3+ has received much attention as an important activator.…”

Section: Introductionmentioning

confidence: 90%

Color-tunable light emission of SrLa4-x-ySi3O13:xTb3+, yEu3+ phosphors by energy transfer process for warm white LEDs

et al. 2018

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SrLa4-x-ySi3O13: xTb3+, yEu3+ phosphor was prepared by high temperature solid-state method. The luminescent centers of Eu3+ and Tb3+ occupying La3+ lattice sites in hosts were confirmed by Rietevld refinement method. The phenomenon of self-cross-relaxation energy transfer is observed between Tb3+ ions from 5D4-7FJ to 7F6-5D4 transition. Additionally, the direction of energy transfer (ET) was observed from Tb3+ to Eu3+ ions, and ET efficiency became more efficient as the concentration of activator increases. The type of ET between Tb3+ and Eu3+ ions was demonstrated to be the dipole-dipole mechanism. The multi-color lights were realized covering the green to red visible region by the route of energy transfer. Furthermore, the decrease of Eu3+ emission intensity resulting from thermal quenching can be effectively compensated by Tb3+→Eu3+ ET. The excellent luminescent properties and thermal stability show this phosphor to be a promising candidate for white LEDs.

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