The first object of the present invention is to provide a blue phosphorescent light-emitting organic electroluminescent (EL) device driven at low voltage, and a display and illuminating device each using such an organic EL device. The second object of the present invention is to provide an organic EL device having long life, and an illuminating device and display each using such an organic EL device. Each organic EL device comprises an electrode and at least one organic layer on a substrate, and at least one of the organic layers is a light-emitting layer containing a host compound and a phosphorescent compound. In order to accomplish the first object, the host compound has an HOMO of from -7.20 to -5.42 eV and an LUMO of from -2.30 to -0.50 eV, and the phosphorescent compound is represented by the general formula (1). In order to accomplish the second object, the host compound is an electron-transporting host compound having an excited triplet energy T1 of not less than 2.7 eV, and the phosphorescent compound has an HOMO of from -5.15 to -3.50 eV and an LUMO of from -1.25 to +1.00 eV.
本发明的第一个目的是提供一种在低电压下驱动的蓝色
磷光发光有机电致发光(EL)器件,以及使用这种有机EL器件的显示器和照明设备。本发明的第二个目的是提供一种具有长寿命的有机电致发光器件,以及使用这种有机电致发光器件的照明装置和显示器。每个有机电致发光器件包括一个电极和基板上的至少一个有机层,其中至少一个有机层是包含主化合物和
磷光化合物的发光层。为了实现第一个目标,主化合物的 HOMO 为 -7.20 至 -5.42 eV,LUMO 为 -2.30 至 -0.50 eV,
磷光化合物由通式(1)表示。为了实现第二个目标,宿主化合物是一种电子传递宿主化合物,其激发三重态能量T1不小于2.7eV,
磷光化合物的HOMO为-5.15至-3.50eV,LUMO为-1.25至+1.00eV。