Air-stable and visible-light-active p-type organic long-persistent-luminescence system by using organic photoredox catalyst
Air-stable and visible-light-active p-type organic long-persistent-luminescence system by using organic photoredox catalyst
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DOI：
10.26434/chemrxiv.14029313.v1
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发表时间：
2021-02
期刊：
影响因子：
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通讯作者：
Kazuya Jinnai;R. Kabe;Zesen Lin;C. Adachi
中科院分区：
文献类型：
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作者：
Kazuya Jinnai;R. Kabe;Zesen Lin;C. Adachi
有机长余辉发光（OLPL）材料表现出长达一小时的光致发光，与无机材料相比具有优势，例如可持续性、柔性和可加工性。OLPL材料以中间电荷分离状态存储所吸收的能量，但是这种电荷分离状态对氧不稳定，并且在空气中不表现出持久发光。OLPL的激发波长可以通过电子给体和电子受体材料来控制，但以前的材料主要需要在紫外区的吸收。在这里，我们展示了在空气中表现出持久发光的OLPL系统，并且可以由300 nm至600 nm的波长激发。通过使用阳离子光氧化还原催化剂作为电子接受掺杂剂，通过空穴扩散过程产生稳定的电荷分离态，与依赖于电子扩散的先前OLPL系统相反。通过利用空穴扩散机制和降低最低未占分子轨道的能级，OLPL系统在空气中变得稳定，并且可以被可见光激发。空穴俘获材料的加入增加了LPL持续时间。
Organic long-persistent-luminescent (OLPL) materials that exhibit hour-long photoluminescence have advantages over inorganic materials, such as a sustainability, flexibility, and processability. The OLPL materials store the absorbed energy in an intermediate charge-separated state, but this charge-separated state is unstable to oxygen and does not exhibit persistent luminescence in air. The excitation wavelength of OLPL can be controlled by electron-donor and -acceptor materials, but previous materials require absorption mainly in the ultraviolet region. Here, we show OLPL systems that exhibit a persistent luminescence in air and can be excited by a wavelength from 300-nm to 600-nm. By using cationic photoredox catalysts as an electron-accepting dopant, stable charge-separated states are generated by the hole-diffusion process, as opposed to previous OLPL systems that depend on electron diffusion. By using a hole-diffusion mechanism and reducing the energy level of the lowest unoccupied molecular orbital, the OLPL system becomes stable in air and can be excited by visible light. The addition of hole-trapping material increases the LPL duration.