TY - JOUR
T1 - Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films
AU - Zhao, Li
AU - Komino, Takeshi
AU - Kim, Dae Hyeon
AU - Sazzad, Muhammad Hasnan
AU - Pitrat, Delphine
AU - Mulatier, Jean Christophe
AU - Andraud, Chantal
AU - Ribierre, Jean Charles
AU - Adachi, Chihaya
N1 - Funding Information:
C. A. acknowledges funding and support from the International Institute for Carbon Neutral Energy Research (WPI-I2CNER) sponsored by the Ministry of Education, Culture, Sports, Science and Technology (MEXT).
Publisher Copyright:
© The Royal Society of Chemistry.
PY - 2016
Y1 - 2016
N2 - Horizontal orientation of light-emitting chromophores plays a critical role in the light outcoupling efficiency and the overall performances of organic light-emitting diodes. Here, we demonstrate that such a horizontal orientation of light-emitting molecules can be achieved in solution-processed blends containing highly fluorescent oligofluorenes dispersed into various small molecule host materials. The influences of the host material, the solvent used for the spin-coating, the doping concentration of the oligofluorenes and the oligofluorene chemical structure on these orientational processes are investigated using variable angle spectroscopic ellipsometry and angle-dependent photoluminescence measurements. By clarifying the roles played by these parameters in the horizontal orientation of the emitters, the results provide crucial insights into these molecular orientational processes in spin-coated glassy organic thin films, which should be relevant for the development of high-efficiency solution-processed organic light-emitting diodes in the near future.
AB - Horizontal orientation of light-emitting chromophores plays a critical role in the light outcoupling efficiency and the overall performances of organic light-emitting diodes. Here, we demonstrate that such a horizontal orientation of light-emitting molecules can be achieved in solution-processed blends containing highly fluorescent oligofluorenes dispersed into various small molecule host materials. The influences of the host material, the solvent used for the spin-coating, the doping concentration of the oligofluorenes and the oligofluorene chemical structure on these orientational processes are investigated using variable angle spectroscopic ellipsometry and angle-dependent photoluminescence measurements. By clarifying the roles played by these parameters in the horizontal orientation of the emitters, the results provide crucial insights into these molecular orientational processes in spin-coated glassy organic thin films, which should be relevant for the development of high-efficiency solution-processed organic light-emitting diodes in the near future.
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U2 - 10.1039/c6tc02861f
DO - 10.1039/c6tc02861f
M3 - Article
AN - SCOPUS:85003029354
VL - 4
SP - 11557
EP - 11565
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
SN - 2050-7526
IS - 48
ER -