Zhao Tonghan, Duan Pengfei
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), No.11, ZhongGuanCun BeiYiTiao, Beijing, 100190, P.R. China.
Present address T. Zhao, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
Angew Chem Int Ed Engl. 2024 Jul 1;63(27):e202406524. doi: 10.1002/anie.202406524. Epub 2024 May 14.
Circularly polarized luminescence (CPL)-active materials are increasingly recognized for their potential applications such as 3D imaging, data storage, and optoelectronic devices. Typically, CPL materials have required high-energy (HE) photons for excitation to emit low-energy (LE) circularly polarized light, a process known as downshifting CPL (DSCPL). However, the emergence of upconverted CPL (UCCPL), where the absorption of multi LE photons results in the emission of a single HE photon with circular polarization, has recently attracted considerable attention. This minireview highlights the intricate relationship between upconversion and CPL phenomena. During upconversion, the dissymmetry factor (g) value can be improved in certain systems. Additionally, the integration of both LE and HE photons in upconversion-downshifting-synergistic systems offers avenues for dual-excitation or dual-emission CPL functionalities. More in detail, the emerging UCCPL based on various photon upconversion mechanisms and their synergy with DSCPL are introduced. Additionally, several examples that demonstrate the applications of UCCPL are presented to highlight the future opportunities.
圆偏振发光（CPL）活性材料因其在3D成像、数据存储和光电器件等潜在应用中而日益受到认可。通常，CPL材料需要高能（HE）光子来激发，以发射低能（LE）圆偏振光，这一过程称为下转换CPL（DSCPL）。然而，上转换CPL（UCCPL）的出现最近引起了相当大的关注，在UCCPL中，多个LE光子的吸收导致发射具有圆偏振的单个HE光子。本综述强调了上转换与CPL现象之间的复杂关系。在上转换过程中，某些系统中的不对称因子（g）值可以得到改善。此外，上转换-下转换协同系统中LE和HE光子的整合为双激发或双发射CPL功能提供了途径。更详细地说，介绍了基于各种光子上转换机制的新兴UCCPL及其与DSCPL的协同作用。此外，还给出了几个展示UCCPL应用的例子，以突出未来的机遇。
