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Resonance-Activated Spin-Flipping for Efficient Organic Ultralong Room-Temperature Phosphorescence

机译：共振激活自旋翻转可实现高效的有机超长室温磷光

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摘要

Triplet-excited-state-involved photonic and electronic properties have attracted tremendous attention for next-generation technologies. To populate triplet states, facile intersystem crossing (ISC) for efficient exciton spin-flipping is crucial, but it remains challenging in organic molecules free of heavy atoms. Here, a new strategy is proposed to enhance the ISC of purely organic optoelectronic molecules using heteroatom-mediated resonance structures capable of promoting spin-flipping at large singlet-triplet splitting energies with the aid of the fluctuation of the state energy and n-orbital component upon self-adaptive resonance variation. Combined experimental and theoretical investigations confirm the key contributions of the resonance variation to the profoundly promoted spin-flipping with ISC rate up to approximate to 10(7) s(-1) in the rationally designed N Symbol of the Klingon Empire P(sic)X (X = O or S) resonance molecules. Importantly, efficient organic ultralong room-temperature phosphorescence (OURTP) with simultaneously elongated lifetime and improved efficiency results overcoming the intrinsic competition between the OURTP lifetime and efficiency. With the spectacular resonance-activated OURTP molecules, time-resolved and color-coded quick response code devices with multiple information encryptions are realized, demonstrating the fundamental significance of this approach in boosting ISC dynamically for advanced optoelectronic applications.
机译：涉及三重态激发态的光子和电子性质已引起下一代技术的极大关注。为了填充三重态，有效的激子自旋翻转的简便系统间穿越（ISC）是至关重要的，但在不含重原子的有机分子中仍然具有挑战性。在这里，提出了一种新的策略，使用杂原子介导的共振结构增强纯有机光电分子的ISC，该结构能够借助态能和n轨道分量的波动促进大单重态-三重态分裂能的自旋翻转。自适应共振变化。结合实验和理论研究，在合理设计的克林贡帝国P符号（sic）中，共振变化对ISC速率高达10（7）s（-1）的深层自旋翻转的关键贡献。 X（X = O或S）个共振分子。重要的是，有效的有机超长室温磷光（OURTP）可以同时延长寿命和提高效率，从而克服了OURTP寿命和效率之间的内在竞争。借助引人注目的共振激活OURTP分子，实现了具有多种信息加密功能的时间分辨和彩色编码的快速响应代码设备，证明了该方法在为先进光电应用动态增强ISC方面的根本意义。

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