Temperature-dependent spectra of YPO4:Me (Me=Ce, Pr, Nd, Bi)

Jüstel, Thomas; Huppertz, P.; Mayr, W.; Wiechert, Detlef

doi:10.1016/j.jlumin.2003.10.004

Cited by 79 publications

(40 citation statements)

References 12 publications

(19 reference statements)

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“…(4) Under 150-156 nm excitation, the characteristic quenching concentration of 5 D 4 -7 F J transitions is 10%, and this excitation region could be attributed to charge transition (CT) from O 2-:2P 6 to Y 3+ :4P 6 (4d+5s) [16] . This attribution is also coincident with the identification of CT band of Y 3+ -O 2-in some other systems confirmed in spectra [18][19][20][21] . In particular, the CT of Y 3+ -O 2-transition overlaps the broad borate host absorption band (144 -186 nm).…”

Section: Resultssupporting

confidence: 85%

The concentration quenching characteristics of 5D3-7F J and 5D4-7F J (J=0–6) transitions of Tb3+ in YBO3:Tb3+ phosphor

et al. 2007

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J = 0-6) transitions of Tb 3+ in YBO 3 :Tb under 130-290 nm excitation were systematically investigated. The results revealed that the quenching concentrations of both 5 D 3 -7 F J and 5 D 4 -7 F J transitions of Tb 3+ in YBO 3 :Tb were mainly dependent on excitation wavelength. Particularly, the quenching concentrations of 5 D 4 -7 F J transitions of Tb 3+ under 130-290 nm excitation were correlated with excitation bands of YBO 3 :Tb. The quenching concentrations of 5 D 3 -7 F J transitions remained at low concentration (2%) under 186-290 nm excitation and then increased gradually with energy of incoming excitation photon when excited at 130-186 nm. This dependence should be involved in their excitation mechanisms and quenching pathway in particular excitation region. quenching concentration, YBO 3 :Tb 3+ , 5 D 3 -7 F J , 5 D 4 -7 F JThe emission intensity of many phosphors as a function of activator concentration initially increases with activator concentration and then decreases, going through a maximum at some concentration. The decreases in emission intensity at a certain activator concentration are referred to as the phenomenon of "concentration quenching" [1,2] . And the optimal activator concentration with the highest emission intensity is considered as "quenching concentration" of phosphors. A complete characterization of the emission quenching behaviors in inorganic phosphors is very important not only for technological design but also for the basic understanding of the physical excitation processes [3][4][5][6][7] .On the other hand, YBO 3 :Tb with high absorption edge and short decay time in vacuum ultraviolet (VUV) region is an inorganic green phosphor used in plasma display panels (PDPs), Hg-free lamps and back lighting fields [8,9] . Generally, the emission of Tb 3+ consists of the 5 D 3 -7 F J and 5 D 4 -7 F J (J = 0-6) transitions. Among them, the 5 D 4 -7 F 5 transition at 543 nm is the dominant emission and mainly contributes to the green component. The presence of 5 D 3 -7 F J transitions at 380-480 nm not only decreases the emission intensity of 5 D 4 -7 F 5 transition but also leads to chromaticity problems [10] . Therefore, a fundamental study on the emission and quenching characteristics of 5 D 3 -7 F J transitions is as important as that on the 5 D 4 -7 F 5 transition for YBO 3 :Tb phosphors.In recent years, much attention has been paid to the emission characteristics of 5 D 4 -7 F 5 transition of Tb 3+ -doped phosphors [8][9][10][11][12] . However, there are few reports about the fundamental study on quenching behaviors of both 5 D 3 -7 F J and 5 D 4 -7 F J transitions of Tb 3+ -doped phosphors in VUV region.In this work, the emission characteristics of the 5 D 3 , 4 -7 F J (J=0-6) transitions of YBO 3 :Tb phosphors under

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Section: Resultssupporting

confidence: 85%

The concentration quenching characteristics of 5D3-7F J and 5D4-7F J (J=0–6) transitions of Tb3+ in YBO3:Tb3+ phosphor

et al. 2007

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“…Thus, Bi-doped YGG belongs to the compounds with smaller distortion of Bi polyhedron, restricted relaxation of its excited state and Stokes shift is calculated of only 0.36 eV. Smaller Stokes shift usually results in higher energy barrier for thermal quenching and such compounds show luminescence up to very high temperatures as shown recently for Bi:YPO 4 [16]. Temperature dependence of the luminescence decay and intensity of Bi:Y 3 Ga 5 O 12 (Bi = 0.061 mol.%) were followed between room temperature and 180°C.…”

Section: Resultsmentioning

confidence: 82%

Study on shaped single crystal growth and scintillating properties of Bi‐doped rare‐earth garnets

Novoselov

Yoshikawa

Nikl

et al. 2005

Cryst. Res. Technol.

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“…The emission spectrum of Nd 3+ -doped YPO 4 bulk crystals showed many peaks above 300 nm resulting from transitions from the 2G(2) 9/2 state of Nd 3+ . This 2G(2) 9/2 state is populated by non-radiative relaxation from the excited 4f 2 5d 1 state, which is populated due to excitation at 160 nm [12].…”

Section: Methodsmentioning

confidence: 99%

“…YPO 4 has been synthesized by precipitation [10], sol-gel [11] and solid-state reaction methods and so on [12]. In this paper, we synthesized Nd 3+ -doped YPO 4 nanocrystals by combustion method with urea as the fuel.…”

Section: Introductionmentioning

confidence: 99%