Disclosed is an organic electroluminescent device, comprising a substrate and light emitting units formed in sequence on the substrate, characterized in that, each of the light emitting units comprises a first electrode layer (1), a light emitting layer (2) and a second electrode layer (3), the light emitting layer comprises a host material and a dye, the host material is made of materials having both electron transport capability and hole transport capability; at least one material in the host material has a CT excited triplet state energy level T1 greater than its n-π excited triplet state energy level S1, and T1-S1 ≤ 0.3eV; or, at least one material in the host material has a CT excited triplet state energy level T1 greater than its n-π excited triplet state energy level S1, and T1-S1 ≥ 1eV, with the difference between its n-π excited second triplet state energy level and its CT excited first singlet state energy level being in the range of -0.1eV to 0.1eV. The organic electroluminescent device configuration can sufficiently utilize the triplet state energy in the host material and the dye to increase the luminous efficiency and prolong the service life of the device.
公开了一种有机电致发光器件,包括基底和在基底上依次形成的发光单元,其特征在于,每个发光单元包括第一电极层(1)、发光层(2)和第二电极层(3),发光层包括宿主材料和
染料,宿主材料由同时具有电子传输能力和空穴传输能力的材料制成;宿主材料中至少有一种材料的 CT 激发三重态能级 T1 大于其 n-π 激发三重态能级 S1,且 T1-S1 ≤ 0.3eV;或者,宿主材料中至少一种材料的CT激发三重态能级T1大于其n-π激发三重态能级S1,且T1-S1≥1eV,其n-π激发第二三重态能级与CT激发第一单重态能级之差在-0.1eV至0.1eV范围内。这种有机电致发光器件结构可以充分利用主材料和
染料中的三重态能量,从而提高发光效率并延长器件的使用寿命。