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Scintillation properties of selected oxide monocrystals activated with Ce and Pr

Scintillation properties of selected oxide monocrystals activated with Ce and Pr. A . J. Wojtowicz 1) , W. Drozdowski 1) , and D. Wisniewski 1) J.L. Lefaucheur 2) , Z. Galazka 2) , and Zhenhui Gou 2) T. Lukasiewicz 3) , and J. Kisielewski 3).

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Scintillation properties of selected oxide monocrystals activated with Ce and Pr

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  1. Scintillation properties of selected oxide monocrystals activated with Ce and Pr A.J. Wojtowicz 1), W. Drozdowski 1), and D. Wisniewski 1)J.L. Lefaucheur 2), Z. Galazka 2), and Zhenhui Gou 2)T. Lukasiewicz 3), and J. Kisielewski 3) 1) Institute of Physics, N. Copernicus University, Torun, Poland 2) Photonic Materials, Ltd, Bellshill, Scotland 3) Institute of Electronic Materials Technology, Warszawa, Poland Polish-French-Israeli Symposium„Spectroscopy of Modern Materials in Physics and Biology” Bedlewo, Poland, Sept. 27-30, 2004

  2. OUTLINE Institutions, projects, crystals Ce and Pr in solid state matrix Ce and Pr - energy structure Experimental results and discussion: RadioluminescenceVUV spectroscopyScintillation light yieldScintillation time profilesradio- and thermoluminescence Summary A.J. Wojtowicz, Bedlewo, Sept. 2004

  3. Institutions and R&D projects:Photonic Materials Ltd (PML)R&D on LYSO:Ce, LuAP:Ce, LuYAP:CePML manufactures LYSO and is the only company supplying large LuAP and LuYAP crystals on commercial scaleInstitute of Electronic Materials Technology (ITME)development of LuAP:Ce, LuAP:Pr, YAP:Ce, YAP:Pr, YAG:PrInstitute of Physics, N. Copernicus University (UMK)Research, characterization of scintillator materialsFUNDING: PML, Polish government (KBN) grants A.J. Wojtowicz, Bedlewo, Sept. 2004

  4. CRYSTALSoxyorthosilicates (Re2SiO5): LSO, LYSOAl perovskites (ReAlO3): YAP, LuAP, LuYAPAl garnets (Re3Al5O12): YAG ActivatorsCe3+ [Xe] 4f1, [Xe] 5d1Pr3+ [Xe] 4f2, [Xe] 4f15d1 2+ ion level pinned to cb3+ ion ground level (g) above vb 3+ ion excited level (e) below cb f and d levels A.J. Wojtowicz, Bedlewo, Sept. 2004

  5. ENERGY STRUCTURE of Ce3+ and Pr3+ ionsCe3+ - broad band parity allowed emission from 5d to 4f, 360 nm, YAP, LuAP 17 ns, LSO 40 ns; no nonradiative d-f relaxation Pr3+ - broad band, parity allowed emission from 5d to 4f: YAP, LuAP 250 nm, 8 ns, YAG, 320 nm, 10 ns; sharp line, parity forbidden f-f emissions at 500 and 620 nm; nonradiative d-f relaxation; collective Pr-Pr interactions A.J. Wojtowicz, Bedlewo, Sept. 2004

  6. Radioluminescence spectra LuAP:Pr (ITME) various Pr concentrations for higher Pr concentrations less host and more f-f emissions A.J. Wojtowicz, Bedlewo, Sept. 2004

  7. Radioluminescence spectra YAG:Pr (ITME) various Pr concentrations for higher Pr concentrations less host emission no change in f-f emissions A.J. Wojtowicz, Bedlewo, Sept. 2004

  8. VUV spectroscopy Excitation spectra LYSO:Ce (PML) 11 K em. 400 nm (Ce1) two time gates, prompt and delayed slow emission excited at the bandgap peak A.J. Wojtowicz, Bedlewo, Sept. 2004

  9. VUV spectroscopy Excitation spectra LYSO:Ce (PML) 11 K em. 480 nm (Ce2) thick line em. 320 nm (host) thin line host emission excitonic origin A.J. Wojtowicz, Bedlewo, Sept. 2004

  10. VUV spectroscopy Luminescence spectra LYSO:Ce (PML) RT VUV excitation solid line UV excitation (Ce2 band), dashed line A.J. Wojtowicz, Bedlewo, Sept. 2004

  11. VUV spectroscopy Luminescence spectra LYSO:Ce (PML) 11 K VUV excitation thick solid line UV excitation (Ce2 band), dashed line A.J. Wojtowicz, Bedlewo, Sept. 2004

  12. VUV spectroscopy Luminescence time profiles LYSO:Ce (PML) 11 K At 390 nm excited by 109 nmthick line At 390 nm, excited by 293 nm (Ce1) thin solid line At 500 nm, excited by 317 nm (Ce2) thin dashed line A.J. Wojtowicz, Bedlewo, Sept. 2004

  13. Energy spectra YAG:Pr, LuYAP:Ce, LuAP:Ce, LYSO:Ce, LSO:Ce, and BGO amount of light (x axis) vs no of scintillations (y axis) Photopeak and Compton edge, backscatter peak Na22 (511 and 1274 keV) 1500 V, gain 3 or 9 Hamamatsu R2059 A.J. Wojtowicz, Bedlewo, Sept. 2004

  14. Scintillation time profiles at RT LuAP:Pr, 9.4 ns YAG:Pr, 17.6 ns LuYAP:Ce, 16.9 ns LuAP:Ce, 15.9 ns LYSO:Ce, 29.1 and 57.1 ns LSO:Ce, 38.6 ns BGO, 10.9 ns and 274 ns LuYAP:Ce, LuAP:Ce, LYSO:Ce, LSO:Ce, and BGO A.J. Wojtowicz, Bedlewo, Sept. 2004

  15. Steady state radioluminescence (flat) and thermoluminescence (starting at 0 time) Irradiation by X-rays at 10 K TL runs from 10 to 300 K FRACTIONS: YAG:Pr, 0.28 LuYAP:Ce, 0.41 LuAP:Ce 0.17 LYSO:Ce, 0.001 LYSO – no loss to traps! A.J. Wojtowicz, Bedlewo, Sept. 2004

  16. Summary Ce3+ and Pr3+ are good recombination centers LuAP:Pr is the fastest, LYSO the most efficient new scintillator material LY of LYSO from PML is about 20% higher than LY of LSO Pr-Pr interaction degrades scintillator performance of LuAP:Pr YAG:Pr is a new potentially interesting addition to scintillators Traps are responsible for loss of efficiency and slow components in LuAP, LuYAP and YAG, no loss to traps in LYSO A.J. Wojtowicz, Bedlewo, Sept. 2004

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