Blue organic light-emitting diodes based on solution-processed fluorene derivative.
We report blue fluorescent organic light-emitting devices (OLED) by solution process utilizing a blue emitting small molecule, 2,7-bis[(9-ethyl-9H-carbazol-3-yl)ethenyl]-9,9-bis(4-n-octyloxyphenyl)-9H-fluorene (CB), which has good solubility in common organic solvent. The peak positions of absorption and emission spectra of a new fluorene-based molecule in tetrahydrofuran solution were observed at 399 and 439 nm, respectively. We achieved a maximum luminous efficiency of approximately 3 cd/A with CIE color coordinates of (0.15, 0.15) in our device.
Department of Advanced Materials, Hannam University, Daejeon 305-701, Korea.
Namchul
N
Cho
Byoung-Ki
BK
Choi
Hwansoo
H
Suh
Jong-Jin
JJ
Park
Jong-Min
JM
Kim
Kwang-Sup
KS
Lee