VUV spectroscopy and low temperature thermoluminescence of LSO:Ce and YSO:Ce

Drozdowski, Winicjusz; Wojtowicz, A.J.; Wiśniewski, D.; Szupryczyński, P.; Janus, Sebastian; Lefaucheur, J.; Gou, Zhenkun

doi:10.1016/j.jallcom.2004.03.016

Cited by 49 publications

(29 citation statements)

References 13 publications

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“…[1][2][3][4] Moreover, it is one of the first UV emitting materials, which manifests up-conversion of blue radiation into the UV-C range. 5 Interest rose in UV-A and UV-B emitting luminescent materials after the introduction of low-pressure Hg discharge lamps that were developed as sun tan lamps in the middle of the 20 th century.…”

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confidence: 99%

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Broxtermann

Engelsen

Fern

et al. 2017

ECS J. Solid State Sci. Technol.

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Herein we describe the synthesis, characterization, and cathodoluminescence of the UV emitting phosphors YPO 4 :Pr 3+ , Y 2 SiO 5 :Pr 3+ , YBO 3 :Pr 3+ , and YPO 4 :Bi 3+ . These photoluminescent UV phosphors exhibited strong luminescence in the UV part of the electromagnetic spectrum when excited by electron bombardment. Spectra have been recorded between 210 and 650 nm at electron beam energies of 5, 10 and 15 keV. The energy efficiencies of YPO 4 :Pr 3+ , Y 2 SiO 5 :Pr 3+ , YBO 3 :Pr 3+ and YPO 4 :Bi 3+ in the UV range were 9.2%, 2.7%, 5.1%, and 7.2%, respectively at 15 keV. UV photoluminescence measurements were conducted using 160 nm excitation generated by combining a VUV monochromator with a deuterium lamp. The UV emitting phosphor Y 2 SiO 5 :Pr 3+ has attracted attention both because of its potential application as a UV tunable laser and also as a scintillator arising from its short decay time (of about 40 ns).1-4 Moreover, it is one of the first UV emitting materials, which manifests up-conversion of blue radiation into the UV-C range. 5Interest rose in UV-A and UV-B emitting luminescent materials after the introduction of low-pressure Hg discharge lamps that were developed as sun tan lamps in the middle of the 20 th century. 6 The early UV emitting phosphors were activated by Tl + , Pb 2+ , or Bi 3+ , while later Ce 3+ activated phosphors such as LaPO 4 :Ce and YPO 4 :Ce came into play due to their better stability and environmental compliance as they contained no hazardous elements.The development of phosphors emitting in the UV-C range was stimulated by the advent of efficient dielectric barrier Xe discharge lamps some decades ago. [7][8][9] At that time, some UV- have since become less interesting due to the toxic character of these materials. One of the most efficient UV-C emitting materials, which also has a rather high thermal quenching temperature, is YPO 4 :Bi .10 However a serious drawback with this material is the limited stability of Bi 3+ cations toward oxidation or reduction. This necessitated a search for efficient and long-term stable Pr 3+ activated materials, since it is thought that Pr 3+ can withstand the harsh conditions of VUV radiation and the electron bombardment inside an excimer discharge tube. The most efficient materials amongst the many, which have been published so far are YPO 4 :Pr, LaPO 4 :Pr, Y 2 SiO 5 :Pr, YBO 3 :Pr, Ca 9 Y(PO 4 ) 7 :Pr, LuBO 3 :Pr, Lu 2 SiO 5 :Pr and LuPO 4 :Pr. The later Lutetium containing compounds are also regarded as scintillators because of their high density.Xe excimer discharge lamps containing a UV-C phosphor for germicidal action and photochemical purposes have been developed by several groups 11-13 and lamp products containing YPO 4 :Nd, YPO 4 :Pr, YPO 4 :Bi, and LaPO 4 :Pr were introduced several years ago. Even though these lamps can achieve wall plug efficiency close to that of low-and medium-pressure Hg discharge lamps, their commercial success is rather moderate so far. The main reason for this observation is their lower long-term stabi...

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confidence: 99%

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Broxtermann

Engelsen

Fern

et al. 2017

ECS J. Solid State Sci. Technol.

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“…It is well known that Ce ions can substitute the bulk rare earth elements (Lu and Y in this case) in two sites: the so-called Re1 site has seven nearest neighbour O atoms and the PL band is peaked at 394 nm while the Re2 site is bound to only six oxygen atoms and the PL peak is centred at 460 nm. 19 The slight difference in the emission spectra of the SG sample excited with high energy light could be attributed to a different contribution of the Re1 and Re2 emissions with respect to the monocrystalline sample. The presence of two Ce-related emitting centres is confirmed by site selective PLE spectra of SG sample (Fig.…”

Section: Resultsmentioning

confidence: 97%

Optical and structural characterization of cerium doped LYSO sol–gel polycrystal films: potential application as scintillator panel for X-ray imaging

Ricci¹,

Carbonaro²,

Casu³

et al. 2011

J. Mater. Chem.

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The optical and structural properties of sol-gel prepared polycrystalline films of Cerium doped Lutetium and Yttrium oxyorthosilicates (Ce:LYSO) are investigated by means of optical spectroscopy, XRD diffraction and Raman spectroscopy. The sol-gel samples are compared to commercially available Ce-doped LYSO single crystals, and a detailed study of the emission properties from the different cerium sites is performed. The main result is that the polycrystalline films do show very good radioluminescence properties for possible applications as X-ray scintillating panels. The structural characterization indicates that the sol-gel polycrystals have similar phase composition to commercial monocrystals; concerning the excitation and emission properties, the same radiative recombination channels are observed in the polycrystals and commercial monocrystals with a slightly faster decay time in the first case. In addition, low temperature measurements (8 K) indicate the presence of a nonradiative cross-relaxation mechanism among cerium ions in the sol-gel grown samples in the two possible crystallographic sites. The results indicate the possibility to develop sol-gel synthesized polycrystalline thin films as scintillating materials in the X-ray energy range.

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“…4). If the perturbations induced by the trap distribution on the electronic diffusion remain limited, what is expected is a monotonic increase of the free electron lifetime with decreasing temperature (several studies reported non-uniform distributions of shallow traps in samples of the same composition, see for example [19,20]). Indeed, the rate at which electrons are thermally released from the traps roughly follows an exponential law of the form exp (ÀDE/kT), where DE is the depth of the trap, k the Boltzmann constant and T the temperature.…”

Section: Resultsmentioning

confidence: 99%

Understanding the scintillation efficiency of cerium-doped LSO, LYSO, YSO and LPS crystals from microwave study of photoconductivity and trapping

Loudyi¹,

Guyot²,

Gâcon³

et al. 2007

Optical Materials

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VUV spectroscopy and low temperature thermoluminescence of LSO:Ce and YSO:Ce

Cited by 49 publications

References 13 publications

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Optical and structural characterization of cerium doped LYSO sol–gel polycrystal films: potential application as scintillator panel for X-ray imaging

Understanding the scintillation efficiency of cerium-doped LSO, LYSO, YSO and LPS crystals from microwave study of photoconductivity and trapping

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VUV spectroscopy and low temperature thermoluminescence of LSO:Ce and YSO:Ce

Cited by 49 publications

References 13 publications

Cathodoluminescence and Photoluminescence of YPO4:Pr3+, Y2SiO5:Pr3+, YBO3:Pr3+, and YPO4:Bi3+

Cathodoluminescence and Photoluminescence of YPO4:Pr3+, Y2SiO5:Pr3+, YBO3:Pr3+, and YPO4:Bi3+

Optical and structural characterization of cerium doped LYSO sol–gel polycrystal films: potential application as scintillator panel for X-ray imaging

Understanding the scintillation efficiency of cerium-doped LSO, LYSO, YSO and LPS crystals from microwave study of photoconductivity and trapping

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Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺

Cathodoluminescence and Photoluminescence of YPO₄:Pr³⁺, Y₂SiO₅:Pr³⁺, YBO₃:Pr³⁺, and YPO₄:Bi³⁺