Low molecular organic glasses for blue electroluminescence
Low molecular organic glasses for blue electroluminescence
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DOI：
10.1016/s0379-6779(98)80033-7
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发表时间：
1997-12-01
期刊：
影响因子：
4.4
通讯作者：
Bestgen, H
中科院分区：
文献类型：
--
作者：
Salbeck, J;Yu, N;Bestgen, H
通过螺环连接来改变低分子有机化合物的空间位阻需求，以改善其加工性能和形态稳定性，同时保持其电子性质。这些螺环连接的化合物形成具有高玻璃化转变温度的稳定的非聚合物有机玻璃，通常与无定形聚合物相关。用这些螺环连接的发光或电荷传输材料通过常规的旋涂技术以及通过气相沉积可以制备具有高形态稳定性的高质量非晶膜。基于这些螺环化合物，我们可以得到色纯度高、亮度高、开启电压低的蓝色电致发光器件。通过将空穴传输螺环-PBD与电子传输螺环-PBD组合而制造的蓝光发射双层器件在2.7 V下显示出开启电压，在5 V下显示出500 cd/m（2）的亮度。
Spiro-linkage is used to modify the steric demand of low molecular organic compounds to improve their processability and morphologic stability, while their electronic properties are retained. These spiro-linked compounds form stable nonpolymeric organic glasses with high glass transition temperatures, usually associated with amorphous polymers. High quality amorphous films with high morphologic stability can be prepared with these spiro-linked luminescent or charge transport materials by conventional spin-coating techniques as well as by vapor deposition. Based on these spiro-compounds, blue electroluminescence devices with high color purity, high brightness and low turn-on voltage are presented. A blue light-emitting two-layer device, fabricated by combining a hole transporting spiro-TAD with an electron transporting spiro-PBD, shows a turn-on voltage at 2.7 V and a luminance of 500 cd/m(2) at 5 V. (C) 1997 Elsevier Science S.A.