Deep-blue emitting poly[spiro(dibenzoazasiline-10 ',9-silafluorene)] for power-efficient PLEDs
Deep-blue emitting poly[spiro(dibenzoazasiline-10 ',9-silafluorene)] for power-efficient PLEDs
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用于高能效 PLED 的深蓝色发射聚[螺环(二苯并氮杂硅烷-10',9-硅芴)]
DOI：
10.1039/c8tc03074j
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发表时间：
2018
影响因子：
6.4
通讯作者：
Wang Lixiang
中科院分区：
文献类型：
--
作者：
Xu Xiushang;Li Xuefei;Wang Shumeng;Ding Junqiao;Wang Lixiang
以聚（2，7-螺硅芴）（PSSiBF）为原料，合成了具有深蓝色荧光的聚（5′-（5′′-己基十一烷基）-2，7-二苯并氮杂环己烯-10 ′，9-硅芴）（PSDBASiF），并将二苯并氮杂环己烯取代二苯并硅杂环己烯螺连接到聚（二苯并硅杂环己烯）主链上。由于dibenzoazasiline的给电子性质，发现HOMO和LUMO能级从PSSiBF的−6.10/−2.40 eV上移到PSDBASiF的−5.61/−2.16 eV。同时，观察到PSDBASiF的蓝移吸收和发射最大值，而其膜光致发光量子产率（PLQY）保持接近PSSiBF（0.84）。基于PSDBASiF的PLED实现了1.16 lm W−1的创纪录高功率效率，峰值EQE为2.74%，CIE坐标为（0.16，0.06）。与PSSiBF（<0.2 lm W−1）相比，PSDBASiF的功率效率提高了约6倍，而不会牺牲EQE和色纯度。结果清楚地表明，将螺连接的二苯并氮杂环己基引入聚（二苯并噻咯）中是开发具有深蓝色发射的功率高效含硅聚合物的一种有前途的策略。
Starting from poly(2,7-spirosilabifluorene) (PSSiBF), deep-blue emitting poly(5′-(5′′-hexylundecyl)-2,7-dibenzoazasiline-10′,9-silafluorene) (PSDBASiF) has been newly demonstrated for power-efficient PLEDs, where dibenzoazasiline instead of dibenzosilole is spiro-linked to the poly(dibenzosilole) backbone. Owing to the electron-donating nature of dibenzoazasiline, the HOMO and LUMO energy levels are found to be upshifted from −6.10/−2.40 eV of PSSiBF to −5.61/−2.16 eV of PSDBASiF. Simultaneously, hypsochromic absorption and emission maxima are observed for PSDBASiF, while its film photoluminescence quantum yield (PLQY) remains close to that of PSSiBF (0.84). PLEDs based on PSDBASiF realize a record-high power efficiency of 1.16 lm W−1 together with a peak EQE of 2.74% and CIE coordinates of (0.16, 0.06). Compared with PSSiBF (<0.2 lm W−1), an about 6-fold improvement is achieved for the power efficiency of PSDBASiF without sacrificing the EQE and color purity. The result clearly indicates that the incorporation of spiro-linked dibenzoazasiline into poly(dibenzosilole) is a promising strategy to develop power-efficient silicon-containing polymers with deep-blue emission.