The technological challenge imposed by the time resolution essential to achieve real-time molecular imaging calls for a new generation of ultrafast detectors. In this contribution, we demonstrate that CdSe-based semiconductor nanoplatelets can be combined with standard scintillator technology to achieve 80 ps coincidence time resolution on a hybrid functional pixel. This result contrasts with the fact that the overall detector light output is considerably affected by the loss of index-light-guiding. Here, we exploit the principle of 511 keV energy sharing between a high-Z, high stopping power bulk scintillator, and a nano-scintillator with sub-1 ns radiative recombination times, aiming at a breakthrough in the combined energy and time resolution performance. This proof-of-concept test opens the way to the design and study of larger size sensors using thin nanocomposite layers able to perform as efficient time taggers in a sampling detector geometry of new generation.

时间分辨率对实现实时分子成像必不可少的技术挑战要求新一代超快检测器。在这项贡献中，我们证明了基于CdSe的半导体纳米片可以与标准闪烁体技术结合使用，以在混合功能像素上实现80 ps的重合时间分辨率。该结果与以下事实形成对比：整个检测器的光输出受到指示光导引损耗的显着影响。在这里，我们利用高Z高停止功率体闪烁体和辐射重组时间小于1 ns的纳米闪烁体之间共享511 keV能量的原理，旨在突破组合能量和时间分辨率性能。