A Comparison Study of the TPD Thin Films Prepared by Solution Process and Vacuum Deposition
In this work we report a systematic study of the properties of the solution-processes organic small molecular thin films in order to get an in-depth understanding of the distinctive nature of solutionprocessed thin films. N,N-di(3-methylphenyl)- N,Ndiphenyl- (l,l-biphenyl) -4,4-diamine (TPD), a typical hole transporting compound, was chosen to fabricate films by both solution process and vacuum deposition. The comparison study between the two kinds of TPD films shows that the surface of the solution-processed TPD films is more smooth and hydrophilic than that of the vacuum-deposited film. In addition, the density of the TPD films was measured by two different methods, and an increase in density was observed in solution processed films in comparison with the vacuum-deposited film. The spacecharge-limited current (SCLC) measurements indicate an increased hole transport mobility of the solutionprocessed TPD films over that of the vacuum-deposited film, which may result from the more compact intermolecular stacking in solution-processed TPD films. Finally the light-emitting diodes with a solution-processed TPD layer as the hole-transport layer were fabricated and showed significantly enhanced injected current density and higher luminance relative to the device using the vacuumdeposited TPD film.
organic films small molecule solution process OLEDs
Shu Feng Lian Duan Liudong Hou Juan Qiao Deqiang Zhang Guifang Dong Liduo Wang Yong Qiu
Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education,Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
国际会议
China Display/Asia Display 2011(2011年中国显示/亚洲显示会议)
江苏昆山
英文
505-506
2011-11-07（万方平台首次上网日期，不代表论文的发表时间）