Free carrier absorption in self-activated PbWO 4 and Ce-doped Y 3 (Al 0.25 Ga 0.75 ) 3 O 12 and Gd 3 Al 2 Ga 3 O 12 garnet scintillators

Abstract Nonequilibrium carrier dynamics in the scintillators prospective for fast timing in high energy physics and medical imaging applications was studied. The time-resolved free carrier absorption investigation was carried out to study the dynamics of nonequilibrium carriers in wide-band-gap scintillation materials: self-activated led tungstate (PbWO4, PWO) ant two garnet crystals, GAGG:Ce and YAGG:Ce. It was shown that free electrons appear in the conduction band of PWO and YAGG:Ce crystals within a sub-picosecond time scale, while the free holes in GAGG:Ce appear due to delocalization from Gd3+ ground states to the valence band within a few picoseconds after short-pulse excitation. The influence of Gd ions on the nonequilibrium carrier dynamics is discussed on the base of comparison the results of the free carrier absorption in GAGG:Ce containing gadolinium and in YAGG without Gd in the host lattice.

[1]  M. Korzhik,et al.  Scintillation in cerium-activated gadolinium-based crystals , 1996 .

[2]  J. Ueda,et al.  Bright persistent ceramic phosphors of Ce3+-Cr3+-codoped garnet able to store by blue light , 2014 .

[3]  S. Mathur,et al.  Evidence of the formation of mixed-metal garnets via sol–gel synthesis , 2003 .

[4]  A. Belsky,et al.  Light‐yield improvement trends in mixed scintillation crystals , 2014 .

[5]  B. Lewandowski,et al.  Performance of the prototype of the electromagnetic calorimeter for PANDA , 2011 .

[6]  Paul Lecoq,et al.  Can Transient Phenomena Help Improving Time Resolution in Scintillators? , 2014, IEEE Transactions on Nuclear Science.

[7]  P. Dorenbos,et al.  Intrinsic scintillation pulse shape measurements by means of picosecond x-ray excitation for fast timing applications , 2014 .

[8]  K. Kamada,et al.  Composition Engineering in Cerium-Doped (Lu,Gd)3(Ga,Al)5O12 Single-Crystal Scintillators , 2011 .

[9]  Shunsuke Kurosawa,et al.  Cz grown 2-in. size Ce:Gd 3 (Al,Ga) 5 O 12 single crystal; relationship between Al, Ga site occupancy and scintillation properties , 2014 .

[10]  E. Auffray,et al.  New detecting techniques for a future calorimetry , 2015 .

[11]  Jiyu Fang,et al.  Synthesis and luminescence properties of Y2.94Al5−mGamO12:0.06Ce3+ (1≤m≤2.5) green phosphors for white LEDs , 2016 .

[12]  Krzysztof T. Pozniak,et al.  Time Reconstruction and Performance of the CMS Electromagnetic Calorimeter , 2009, 0911.4044.

[13]  Martin Nikl,et al.  Scintillator-oriented combinatorial search in Ce-doped (Y,Gd)3(Ga,Al)5O12 multicomponent garnet compounds , 2011 .

[14]  J. Ueda,et al.  Yellow persistent luminescence in Ce3+–Cr3+-codoped gadolinium aluminum gallium garnet transparent ceramics after blue-light excitation , 2014 .

[15]  M. Bacci,et al.  Excitonic emission of scheelite tungstates AWO4 (A=Pb, Ca, Ba, Sr) , 2000 .

[16]  A. Sontakke,et al.  Near-infrared multi-wavelengths long persistent luminescence of Nd(3+) ion through persistent energy transfer in Ce(3+), Cr(3+) co-doped Y(3)Al(2)Ga(3)O(12) for the first and second bio-imaging windows , 2015 .

[17]  J. M. Ogiegło.  Luminescence and energy transfer in Garnet Scintillators , 2012 .

[18]  P. Dorenbos.  A Review on How Lanthanide Impurity Levels Change with Chemistry and Structure of Inorganic Compounds , 2013 .

[19]  Vidmantas Gulbinas,et al.  Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3Al2Ga3O12 scintillation crystals , 2016 .

[20]  M. Korzhik,et al.  Lead tungstate scintillation material , 2002 .

[21]  S. A. Payne,et al.  Development of Transparent Ceramic Ce-Doped Gadolinium Garnet Gamma Spectrometers , 2012, IEEE Transactions on Nuclear Science.