In an organic light emitting device, a hole transporting layer 12 is formed on an anode 10, and is then doped with a phosphorescent molecule such as Ir(ppy)3 or the like to thereby form a light emitting layer. On the light emitting layer is formed an electron transporting layer 14 on which is formed a cathode 16. Use of the host material of the present invention makes possible an organic light emitting device having high phosphorescence emission efficiency and high heat-resistance, because energy transfer from the host material to the phosphorescent molecule is easy and the glass transition temperature of the organic molecules used is 100 °C and above. Emission efficiency can be further increased through use in the electron transporting layer 14 use of a compound with an ionization potential at least 0.1 eV greater than that of the hole transporting layer.
* wherein it may form ring structures between R1 and R2 and/or between R3 and R4 and/or between R2 and R3, or at least one of R1, R4 and R5 is a nitrogen or aromatic ring and is a compound connected to at least one more skeleton through said at least nitrogen or aromatic ring, or at least one of R1, R4 and R5 is a nitrogen or aromatic ring and is a compound connected to at least one more skeleton through said at least nitrogen or aromatic ring and alicyclic compound.
在有机发光器件中,阳极 10 上形成空穴传输层 12,然后掺入
磷光分子,如 Ir(ppy)3 等,从而形成发光层。发光层上形成电子传输层 14,电子传输层 14 上形成阴极 16。使用本发明的宿主材料可以制造出具有高
磷光发射效率和高耐热性的有机发光器件,因为从宿主材料到
磷光分子之间的能量转移非常容易,而且所使用的有机分子的
玻璃转化温度在 100 °C 以上。通过在电子传输层中使用电离电位至少比空穴传输层的电离电位高 0.1 eV 的化合物,可进一步提高发射效率。
* 其中可在 R1 和 R2 之间和/或 R3 和 R4 之间和/或 R2 和 R3 之间形成环状结构,或 R1、R4 和 R5 中至少有一个是氮环或芳香环,并且是通过所述至少氮环或芳香环与至少另一个骨架相连的化合物,或 R1、R4 和 R5 中至少有一个是氮环或芳香环,并且是通过所述至少氮环或芳香环与至少另一个骨架相连的化合物和脂环族化合物。