Li Hong-Fei, Liu Xiao-Qi, Lyu Chen, Gorbaciova Jelena, Wen Li-Li, Shan Guo-Gang, Wyatt Peter B, Ye Huan-Qing, Gillin William P
1Materials Research Institute and School of Physics and Astronomy, Queen Mary University of London, Mile End Road, E1 4NS London, UK.
2Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, 130024 China.
Light Sci Appl. 2020 Mar 4;9:32. doi: 10.1038/s41377-020-0266-3. eCollection 2020.
Advanced 1.5-µm emitting materials that can be used to fabricate electrically driven light-emitting devices have the potential for developing cost-effective light sources for integrated silicon photonics. Sensitized erbium (Er) in organic materials can give bright 1.5-µm luminescence and provide a route for realizing 1.5-µm organic light emitting diodes (OLEDs). However, the Er electroluminescence (EL) intensity needs to be further improved for device applications. Herein, an efficient 1.5-µm OLED made from a sensitized organic Er co-doped system is realized, where a "traditional" organic phosphorescent molecule with minimal triplet-triplet annihilation is used as a chromophore sensitizer. The chromophore provides efficient sensitization to a co-doped organic Er complex with a perfluorinated-ligand shell. The large volume can protect the Er 1.5-µm luminescence from vibrational quenching. The average lifetime of the sensitized Er 1.5-µm luminescence reaches ~0.86 ms, with a lifetime component of 2.65 ms, which is by far the longest Er lifetime in a hydrogen-abundant organic environment and can even compete with that obtained in the fully fluorinated organic Er system. The optimal sensitization enhances the Er luminescence by a factor of 1600 even with a high concentration of the phosphorescent molecule, and bright 1.5-µm OLEDs are obtained.
可用于制造电驱动发光器件的先进1.5微米发光材料，有潜力为集成硅光子学开发具有成本效益的光源。有机材料中的敏化铒（Er）能发出明亮的1.5微米光致发光，并为实现1.5微米有机发光二极管（OLED）提供了一条途径。然而，对于器件应用而言，铒电致发光（EL）强度还需要进一步提高。在此，通过一种敏化有机铒共掺杂体系实现了高效的1.5微米OLED，其中使用了一种三重态-三重态湮灭最小的“传统”有机磷光分子作为发色团敏化剂。该发色团能有效地敏化一种带有全氟配体壳层的共掺杂有机铒配合物。较大的体积可以保护铒的1.5微米发光免受振动猝灭。敏化铒1.5微米发光的平均寿命达到约0.86毫秒，其中一个寿命分量为2.65毫秒，这是迄今为止在富氢有机环境中最长的铒寿命，甚至可以与在全氟有机铒体系中获得的寿命相媲美。即使在磷光分子浓度较高的情况下，最佳的敏化作用也能使铒发光增强1600倍，从而获得了明亮的1.5微米OLED。
