High Light Response Uniformity in Industrial Growth of 600-mm-Long BGO Crystals for DArk Matter Particle Explorer

Scintillation properties of Yb-doped Bi4Ge3O12 single crystals emitting near-infrared luminescence

“…43) The transmittance decreased in the range of 350-500 nm in all the samples, and it was considered to be derived from oxygen vacancies since the same tendency was observed in the previous study of undoped BGO. 44) In the measurement, the absorption band derived from Yb 3+ could not be measured since the limitation of the measurement range was 850 nm, although the absorption should be observed at 970 nm according to previous reports on Yb-doped phosphors. 45) Figure 4 shows the PL excitation and emission contour spectra of the 1% Yb-doped sample.…”

Peculiar Structural Effects in Pure and Doped Functional Single Crystals of Complex Compositions

“…Bismuth orthogermanate Bi 4 Ge 3 O 12 (BGO) crystallizes in the eulytin Bi 4 (SiO 4 ) 3 structure. BGO is a self-activated-type scintillator applied in particle scintillation detectors for nuclear, space, and high-energy physics and high-resolution positron emission tomography [65,66]. It is also used as a functional material to create straight waveguides operating in the visible, mid-infrared, and telecommunication band [67,68].…”

Experimental verification of vacancy defects and their vital role on reddish Bi4Ge3O12 single crystals

“…Intensive studies have been conducted on the scintillation properties of BGO. [1][2][3][4][5][6][7] Although scintillation characteristics and radiation resistance have been described in detail in some reports, the essence of the coloration in BGO single crystals still remains a subject of debate. Several mechanisms have been suggested, and various point defect configurations have been considered for free-charge-carrier capture and color-center creation to provide a microscopic interpretation of colorinduced optical absorption.…”