Investigation of Er:Bi4Ge3O12 single crystals emitting near-infrared luminescence for scintillation detectors

Radiation-induced Luminescence Properties of Tm-doped Bi4Ge3O12 Single Crystals

“…(21) However, the limit was inferior to that measured using BGO doped with other rare earths with an InGaAs PD. (39)(40)(41)(42) The main emission of Tm 3+ appeared at 800 nm as shown in Fig. 5.…”

“…They were respectively considered to be derived from the 1 G 4 -3 H 6 and 3 H 4 -3 H 6 transitions of Tm 3+ (37,38) through energy transfer from Bi 3+ to Tm 3+ since the excitation wavelength (280 nm) corresponded to the 1 S 0 -3 P 1 transition of Bi 3+ . (39) Emission at 800 nm due to Tm 3+ was observed under excitation at 680 nm. The quantum yields (QYs) of 0.1, 0.5, and 1% Tm-doped BGO monitored at 750-1700 nm under excitation at 650 nm were 56.7, 23.8, and 19.1%, respectively.…”

“…The 0.1% Tm-doped BGO showed a relatively high QY compared with BGO doped with other rare earths, because the QYs of Nd-, Er-, Pr-, and Yb-doped BGO samples with the optimum doping concentration in the NIR range were respectively reported to be 43, 86, 35, and 26%. (39)(40)(41)(42) The PL decay curves of the samples are shown in Fig. 4.…”

Eu-doped (Y0.85−xLa0.15)2O3sesquioxide transparent ceramics for high-spatial-resolution X-ray imaging

“…12–15 However, these scintillation crystals have shortcomings; for example, BGO is inefficient and expensive and requires high temperature preparation, and CsI:Tl easily undergoes deliquescence and has a high coefficient of thermal expansion and low mechanical strength. 16–19 Therefore, the development of scintillators that are easy to prepare, cheap, stable, and reliable in the environment is essential for X-ray imaging. 20…”

“…[12][13][14][15] However, these scintillation crystals have shortcomings; for example, BGO is inefficient and expensive and requires high temperature preparation, and CsI:Tl easily undergoes deliquescence and has a high coefficient of thermal expansion and low mechanical strength. [16][17][18][19] Therefore, the development of scintillators that are easy to prepare, cheap, stable, and reliable in the environment is essential for X-ray imaging. 20 Polycrystalline ceramics can be prepared in low-cost and homogeneous doping processes, and the sintering process of ceramics can be carried out at temperatures well below the melting point of the material.…”