33000 photons per MeV from mixed (Lu_075Y_025)_3Al_5O_12:Pr scintillator crystals

Abstract

, seems to be an ideal candidate to supercede Lu 3 Al 5 O 12 :0.2%Pr (19000 ph/MeV, 4.6%, 6.7 g/cm 3 ) in various applications. The observed enhancement of light output following the partial substitution of lutetium by yttrium is most probably related to some specific differences in distributions of shallow traps in particular materials.

A preliminary assessment of Lu2Y2Al2O9:Pr (LuYAM:Pr) as a potential scintillator

“…There are more differences than similarities: although both curves are the most intensive between, say, 80 and 240 K, that of LuYAM:Pr consists of less but much broader peaks in this range. Moreover, the TL signal of YAM:Pr vanishes above 320 K (unless there are traps peaking above 350 K), while in case of LuYAM:Pr it increases M A N U S C R I P T A C C E P T E D ACCEPTED MANUSCRIPT page 5 of 9 towards 350 K. Such a feature could indicate that traps are generally deeper in LuYAM:Pr than in YAM:Pr, which agrees with the previous predictions and observations for (Lu,Y)AG:Pr (Dorenbos et al, 2013;Drozdowski et al, 2014 and2016). Likewise in LuAG:Pr and other materials displaying extraordinarily broad glow peaks, a complex structure of the peaks detected in ltTL of LuYAM:Pr (with a probable contribution from quasi-continuous trap distributions) is expected , hence there is no point in deconvoluting them into single peaks obeying one of the simple TL models (e.g.…”

Recent R&D Trends in Inorganic Single‐Crystal Scintillator Materials for Radiation Detection

“…[ 145 ] The same tendency might also be supposed to occur in a perovskite compound considering the reported refl ection spectra in the VUV spectral region. [ 149 ] An additional positive effect that might contribute to the light yield increase would be due to the solid solution host, an effect that has been observed in several material systems. [ 148 ] The recent systematic study of light yield and other characteristics in Prdoped (Lu x Y 1-x ) 3 Al 5 O 12 showed an enormous increase of light yield up, to 33 000 photons MeV −1 for a 1 mm-thick sample of (Lu 0.75 Y 0.25 ) 3 Al 5 O 12 :Pr.…”

Scintillation properties of μPD-grown Y4Al2O9:Pr (YAM:Pr) crystals

“…The studied samples were about 5 mm long rods with diameters of 3 mm. The reference Czochralskigrown (Lu 0.75 Y 0.25 ) 3 Al 5 O 12 :Pr (LuYAG:Pr) crystals were also produced at ITME [6].…”

“…Mixed (Lu x Y 1Àx ) 3 Al 5 O 12 :Pr (LuYAG:Pr) crystals have been recognized to offer higher light outputs at the expense of lower densities. A prominent scintillation yield of as much as 33,000 ph/MeV has been observed for (Lu 0.75 Y 0.25 ) 3 Al 5 O 12 :Pr [6], whereas a further increase of the content of yttrium against lutetium results in a decreasing yield, returning for Y 3 Al 5 O 12 :Pr (YAG:Pr) to the level known for LuAG:Pr [6,7]. Note the light output of RE 3 Al 5 O 12 :Pr crystals is very sensitive to the content of praseodymium: for LuAG:Pr the maximum yield is reached at a real concentration of Pr 3+ ions between 0.2% and 0.3% [1,8], whilst for YAG:Pr an optimal concentration appears to be even an order of magnitude lower [9].…”