Large-sized organic crystals used as scintillators have great potential for X-ray detection and medical diagnosis due to their excellent environmental stability, extremely short fluorescence decay time, and low radiation detection limit. However, poor crystallinity, slow crystal growth speed, and lack of high-quality seed crystals make it challenging to obtain large sizes with high quality. Here, the vertical Bridgman method was introduced to grow organic doped crystals where p-terphenyl was used as the host and six nitrogenous biphenyls were adopted as the dopants. Nitrogen-containing biphenyl-doped p-terphenyl crystals were cultured to get the dimension of Φ 12 mm × 40 mm. Fluorescence spectra show that dopant molecules with molecular packing structures similar to those of the host molecule can achieve successful doping with the host molecule. Under X-ray excitation, the organic doped crystals exhibit tunable luminescence characteristics from blue light (465 nm) to green light (498 nm). Our research provides a reference for achieving successful doping of host and dopant molecules through molecular design.

中文翻译：

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用于有机闪烁体的具有可调谐发光的大尺寸含氮联苯掺杂对三联苯晶体

用作闪烁体的大尺寸有机晶体由于其优异的环境稳定性、极短的荧光衰减时间和较低的辐射检测限，在X射线检测和医学诊断方面具有巨大的潜力。然而，结晶度差、晶体生长速度慢以及缺乏高质量晶种使得获得高质量的大尺寸具有挑战性。这里，引入垂直布里奇曼法来生长有机掺杂晶体，其中对三联苯作为主体，六氮联苯作为掺杂剂。培养含氮联苯掺杂的对三联苯晶体，使其尺寸为Φ12mm×40mm。荧光光谱表明，具有与主体分子相似的分子堆积结构的掺杂剂分子可以与主体分子实现成功的掺杂。在 X 射线激发下，有机掺杂晶体表现出从蓝光（465 nm）到绿光（498 nm）的可调发光特性。我们的研究为通过分子设计实现主体和掺杂剂分子的成功掺杂提供了参考。