TY - JOUR
T1 - Transport and luminescence in naphthyl phenylamine model compounds
AU - Tong, K. L.
AU - So, S.K.
AU - Ng, H. F.
AU - Leung, L. M.
AU - Yeung, M. Y.
AU - Lo, C. F.
N1 - Funding Information:
Support of this research by the Research Grant Council of Hong Kong under grant no. HKBU/2173/04E is gratefully acknowledged. LML would like to acknowledge the support of this work by research grants: RGC/2037/02P and FRG/01-02/II-23. This work is partially supported by the Incentive Fund of the Physics Department of The Chinese University of Hong Kong (CUHK), and was performed in part using the supercomputing system in CUHK's Information Technology Services Center.
PY - 2004/12/7
Y1 - 2004/12/7
N2 - The effects of polar side groups (methoxy, fluoro, and chloro substitution) on the transport and luminescence properties of a series of naphthyl phenylamine (NPA) compounds were examined. The compounds are (i) N,N-diphenyl-1-naphthylamine, (ii) N-(4-methoxyphenyl),N′-pheny1-1- naphthylamine, (iii) N-(4-chlorophenyl),N′-phenyl-l-naphthylamine, and (iv) N-(4-fluorophenyl),N-phenyl-l-naphthylamine. Time-of-flight measurements were used to measure the hole mobilities of the NPA compounds. The hole mobilities were found to correlate with the dipole moments of the compounds. The least polar compound N,N′-diphenyl-1-naphthylamine has the highest mobility in the range of 0.5-2 × 10-4 cm2 V -1 s-1, whereas the most polar compound N-(4-chlorophenyl),N′-phenyl-1-naphthylamine has the lowest mobility in the range of 0.2-2 × 10-6 cm2 V-1 s -1 at room temperature. The dipolar disorder model proposed by Dieckmann and Young is found to be applicable to describe the data. The NPA compounds were further incorporated into a multilayer organic light-emitting diode (OLED) as the light-emitting layer. The OLEDs emit in the range 420-440 nm, and the polar side groups appear to have no clear influence on the emission wavelength of the molecules in solid state.
AB - The effects of polar side groups (methoxy, fluoro, and chloro substitution) on the transport and luminescence properties of a series of naphthyl phenylamine (NPA) compounds were examined. The compounds are (i) N,N-diphenyl-1-naphthylamine, (ii) N-(4-methoxyphenyl),N′-pheny1-1- naphthylamine, (iii) N-(4-chlorophenyl),N′-phenyl-l-naphthylamine, and (iv) N-(4-fluorophenyl),N-phenyl-l-naphthylamine. Time-of-flight measurements were used to measure the hole mobilities of the NPA compounds. The hole mobilities were found to correlate with the dipole moments of the compounds. The least polar compound N,N′-diphenyl-1-naphthylamine has the highest mobility in the range of 0.5-2 × 10-4 cm2 V -1 s-1, whereas the most polar compound N-(4-chlorophenyl),N′-phenyl-1-naphthylamine has the lowest mobility in the range of 0.2-2 × 10-6 cm2 V-1 s -1 at room temperature. The dipolar disorder model proposed by Dieckmann and Young is found to be applicable to describe the data. The NPA compounds were further incorporated into a multilayer organic light-emitting diode (OLED) as the light-emitting layer. The OLEDs emit in the range 420-440 nm, and the polar side groups appear to have no clear influence on the emission wavelength of the molecules in solid state.
KW - Carrier mobility
KW - Organic light-emitting diode
KW - Phenylamine
UR - http://www.scopus.com/inward/record.url?scp=9944260308&partnerID=8YFLogxK
U2 - 10.1016/j.synthmet.2004.06.036
DO - 10.1016/j.synthmet.2004.06.036
M3 - Conference article
AN - SCOPUS:9944260308
SN - 0379-6779
VL - 147
SP - 199
EP - 203
JO - Synthetic Metals
JF - Synthetic Metals
IS - 1-3
T2 - Supramolecular Approaches to Organic Electronics and Nanotechn.
Y2 - 24 May 2004 through 28 May 2004
ER -