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 T
1
greater than its n-π excited triplet state energy level S
1
, and T
1
-S
1
≤0.3 eV; or, at least one material in the host material has a CT excited triplet state energy level T
1
greater than its n-π excited triplet state energy level S
1
, and T
1
-S
1
≥1 eV, 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 −0.1 eV to 0.1 eV. 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.
Photophysical and electrochemical properties and temperature dependent geometrical isomerism in alkyl quinacridonediimines
作者:Iqbal Javed、Ayub Khurshid、Muhammad Nadeem Arshad、Yue Wang
DOI:10.1039/c3nj00477e
日期:——
NMR study of compounds 2, 7 and 10 (for instance), and single crystal X-ray analysis of 2, 3, 6, 7, 8 and 10 indicated that the anomalous behavior is due to the buckled, non-planar structure of the quinacridones. Moreover the molecules existed in two interconvertible geometric isomeric forms at different temperatures. Molecular orbital calculations were performed at B3LYP/6-31+G(d), B3PW91/6-31G(d) and