The title compounds 9-ethyl-1,3,6,8-tetra-p-tolyl-9H-carbazole （1） and 9-ethyl-1,3,6,8-tetrakis-（4-fluoro-phenyl）-9H-carbazole （2） were synthesized and characterized by single-crystal X-ray diffraction. Thereint...The title compounds 9-ethyl-1,3,6,8-tetra-p-tolyl-9H-carbazole （1） and 9-ethyl-1,3,6,8-tetrakis-（4-fluoro-phenyl）-9H-carbazole （2） were synthesized and characterized by single-crystal X-ray diffraction. Thereinto, the crystal structures of compounds 1 and 2 were composed by asymmetry units. The ratio of compounds 1 and 2 to the solvent molecule cyclohexane （CYH） is 4/3. X-ray analysis reveals that the 1,3,6,8-phenyl groups are distorted at large angles relative to the planar carbazole ring. Furthermore, the luminescent and thermal properties of 1 and 2 have also been investigated. It can be seen that thermal stability of compound 1 with p-tolyl is better than that of 2 with 4-fluoro-phenyl. Fluorescence spectra analysis showed that compounds 1 and 2 have strong UV emission.展开更多
We present the experimental evidences showing that three different electron injection models play roles in Alq3 based organic light-emitting diodes in sequence when the thickness of LiF interlayer is changed. It is fo...We present the experimental evidences showing that three different electron injection models play roles in Alq3 based organic light-emitting diodes in sequence when the thickness of LiF interlayer is changed. It is found that the device with a 0.2nm LiF layer displays the largest current with declined luminescence. However, the one with a 0.6 nm LiF layer displays the second largest current and the highest luminescence of all. Combining with the photoluminescent test results, three models, namely chemical reaction at ternary interface, dipole effect at binary interface and tunneling enhancement effect, are expected to play roles in sequence when the LiF thickness is increased from 0 nm to 4 nm.展开更多
基金Supported by the National Natural Science Foundation of China (No. 20972097)the R & D funds for Basic Research Program of Shenzhen (No. 201120)Natural Science Foundation of SZU
文摘The title compounds 9-ethyl-1,3,6,8-tetra-p-tolyl-9H-carbazole （1） and 9-ethyl-1,3,6,8-tetrakis-（4-fluoro-phenyl）-9H-carbazole （2） were synthesized and characterized by single-crystal X-ray diffraction. Thereinto, the crystal structures of compounds 1 and 2 were composed by asymmetry units. The ratio of compounds 1 and 2 to the solvent molecule cyclohexane （CYH） is 4/3. X-ray analysis reveals that the 1,3,6,8-phenyl groups are distorted at large angles relative to the planar carbazole ring. Furthermore, the luminescent and thermal properties of 1 and 2 have also been investigated. It can be seen that thermal stability of compound 1 with p-tolyl is better than that of 2 with 4-fluoro-phenyl. Fluorescence spectra analysis showed that compounds 1 and 2 have strong UV emission.
基金Supported by the National Natural Science Foundation of China under Grant Nos 61106094 and 20972097, the Natural Science Foundation of Guangdong Province under Grant No S2012020011003, the Foundation for Distinguished Young Talents in Higher Education of Guangdong under Grant No LYM11111, and the Shenzhen Science Foundation under Grant Nos JC201005280458A, JCYJ20130329115524512 and JCYJ20120613162231310.
文摘We present the experimental evidences showing that three different electron injection models play roles in Alq3 based organic light-emitting diodes in sequence when the thickness of LiF interlayer is changed. It is found that the device with a 0.2nm LiF layer displays the largest current with declined luminescence. However, the one with a 0.6 nm LiF layer displays the second largest current and the highest luminescence of all. Combining with the photoluminescent test results, three models, namely chemical reaction at ternary interface, dipole effect at binary interface and tunneling enhancement effect, are expected to play roles in sequence when the LiF thickness is increased from 0 nm to 4 nm.
