A novel violet emitter, 1,3-bis[10,10-dimethyl-10H-indeno[2,1-b]]indolo[3,2,1-jk]indolo[1′,2′,3′:1,7]indolo[3,2-b]carbazole (m-FLDID), was designed and synthesized by meta-oriented bis-fusion of two 7,7-dimethyl-5,7-dihydroindeno[2,1-b]carbazole (DMID) subunits for use in a pure violet organic light-emitting diode (OLED). Incorporation of the DMID subunits effectively reduced the nonradiative recombination rate, improving the photoluminescence quantum yield of the m-FLDID emitter. The meta-oriented bis-fusion of the two DMID subunits not only triggered an alternative distribution of the frontier orbitals but also effectively locked the π-conjugation chain, which ultimately resulted in a narrow-band, pure violet emission of the m-FLDID emitter. Doped m-FLDID devices possessed an external quantum efficiency (EQE) of > 5%, pure violet emission with a maximum at 407 nm, a narrow full width at half-maximum of 17 nm, and a Commission Internationale de l’éclairagey coordinate of less than 0.03. This is the first work reporting an EQE of > 5% and an extremely narrow emission spectrum for a pure violet emitter.

中文翻译：

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7,7-二甲基-5,7-二氢茚并[2,1- b ]咔唑用于窄带，纯紫光有机发光二极管的战略同步，效率> 5％，CIE y坐标<0.03

新型的紫光发射体1,3-双[ 10,10-二甲基-10 H-茚满[2,1 - b ]] indolo [3,2,1- jk ] indolo [1'，2'，3'： 1,7]吲哚并[3,2- b ]咔唑（米-FLDID），设计并合成了由间位取向的双-融合2 7,7-二甲基-5,7-二氢茚并[2,1-的b ]用于纯紫罗兰色有机发光二极管（OLED）的咔唑（DMID）亚基。DMID亚基的掺入有效地降低了非辐射复合率，提高了m -FLDID发射体的光致发光量子产率。在元取向两个DMID亚基的双融合不仅触发了前沿轨道的替代分布，而且有效地锁定了π共轭链，最终导致了m -FLDID发射体的窄带纯紫光发射。掺杂中号-FLDID装置在407纳米，在一半最大值处的17纳米的窄全宽度具有> 5％的外量子效率（EQE），纯紫光发射具有最大和委员会国际照明ÿ坐标小于0.03。这是第一项报告的EQE大于5％且纯紫光发射器的发射光谱极窄的工作。