Sky-blue phosphorescent organic light-emitting diodes with dibenzo-24-crown-8 substituted iridium(III) complexes as the dopants

Sky-blue phosphorescent organic light-emitting diodes with dibenzo-24-crown-8 substituted iridium(III) complexes as the dopants
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以二苯并24冠8取代铱(III)配合物为掺杂剂的天蓝色磷光有机发光二极管

DOI:
10.1016/j.dyepig.2016.11.032
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发表时间:
2017-03
期刊:
影响因子:
4.5
通讯作者:
Huang Fei
Huang Fei
中科院分区:
材料科学2区
文献类型:
--
作者:
Liang Aihui;Tang Jun;Cai Ping;Yang Xiulan;Wu Wenjin;Chen Ling;Wang Zhiping;Cai Mingzhong;Huang Fei

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本文报道了以二苯并-24-冠-8单元铱配合物(B1、B2和B3)为掺杂剂,聚乙烯基咔唑(PVK)为聚合物基质,采用旋涂法制备的天蓝色磷光有机电致发光器件(PhOLED)。其中,来自B3的单发射层PhOLED表现出最好的电致发光性能,在4.6 mA cm-2的电流密度下的最大发光效率(LEmax)为10.7 cd A-1,最大亮度(Lmax)为4604 cd m-2。与B1和B3相比,B2作为掺杂剂的器件显示出低得多的器件性能(LEmax= 4.2 cd A− 1和Lmax= 1433 cd m−2),因为B2的辅助配体中存在对三联苯单元,其三重态能级略低于双[(4,6-二氟苯基)吡啶-N,C2′]吡啶甲酸铱(III)(FIrpic)。本工作表明,三重态能级的环化和/或辅助配体的铱配合物,应考虑设计新型电致磷光材料的高效PhOLED。
We report several sky-blue phosphorescent organic light-emitting diodes (PhOLEDs) fabricated by spin-coating technique, using dibenzo-24-crown-8 unit-based iridium complexes (B1, B2 and B3) as the dopants and poly(N-vinylcarbazole) (PVK) as the polymer host. Among these, the single emissive layer PhOLEDs from B3 exhibited the best electroluminescent performances with a maximum luminous efficiency (LEmax) of 10.7 cd A−1at a current density of 4.6 mA cm−2and a maximum brightness (Lmax) of 4604 cd m−2. Compared to B1 and B3, the devices with B2 as dopant displayed much lower device's performances (LEmax= 4.2 cd A−1and Lmax= 1433 cd m−2) as the presence ofp-terphenyl unit in the auxiliary ligand of B2, the triplet energy level of which is slightly less than that of iridium (III) bis[(4,6-difluorophenyl)pyridinato-N,C2′] picolinate (FIrpic). This present work demonstrates that the triplet energy level of the cyclometalated and/or auxiliary ligands of the iridium complexes should be considered to design novel electrophosphorescent materials for highly efficient PhOLEDs.
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