A fluorescent stilbenoid dendrimer for solution-processed blue light emitting diodes

We report a solution processed blue stilbenoid dendrimer based on a 1, 3, 5 - benzene core and endowed with a periphery of electron donating and solubilizing alkoxy chains. Raman analysis it is revealed as a helpful tool to investigate changes from the pristine material to the material in the OLED structure, explaining the differences between the dendrimer single layer thin film photoluminescence (PL) and the electroluminescence (EL) dendrimer active layer emission in the device. We report a blue EL emission (439 nm) and a very promising effective mobility value of 2.55 × 10-5 cm2/(V•s) suggesting good transport properties for non doped blue OLEDs that use air stable Al as the cathode.

[1]  L. Kavan,et al.  An in situ Raman spectroelectrochemical study of the controlled doping of single walled carbon nanotubes in a conducting polymer matrix , 2007 .

[2]  H. Bässler,et al.  Control of mobility in molecular organic semiconductors by dendrimer generation , 2001 .

[3]  F. E. Karasz,et al.  Conductivity anisotropy in oriented poly(p-Phenylene vinylene) , 1984 .

[4]  Vladimir Arkhipov,et al.  Charge injection into light-emitting diodes: Theory and experiment , 1998 .

[5]  M. Kertész,et al.  CONFORMATIONAL INFORMATION FROM VIBRATIONAL SPECTRA OF STYRENE, TRANS-STILBENE, AND CIS-STILBENE , 1997 .

[6]  J. Buisson,et al.  In situ resonant Raman and optical investigations of p-doped poly (p-phenylene vinylene) , 2000 .

[7]  H. Bässler,et al.  Control of Charge Transport and Intermolecular Interaction in Organic Light-Emitting Diodes by Dendrimer Generation , 2001 .

[8]  D. Lin-Vien.  The Handbook of Infrared and Raman Characteristic Frequencies of Organic Molecules , 1991 .

[9]  X. Quintana,et al.  Analytical Evaluation of the Ratio Between Injection and Space-Charge Limited Currents in Single Carrier Organic Diodes , 2008, IEEE Transactions on Electron Devices.

[10]  J. Buisson,et al.  Characterization of photochemically converted poly(para-phenylene vinylene) , 1999 .

[11]  R. Gómez,et al.  On the blue emission of a novel solution-processed stilbenoid dendrimer thin film for OLED displays , 2008 .

[12]  I. Orion,et al.  SPECTROSCOPIC STUDIES OF POLARONIC AND BIPOLARONIC SPECIES IN N-DOPED POLY(PARAPHENYLENEVINYLENE) , 1998 .

[13]  F. Negri,et al.  INFRARED AND RAMAN SPECTRA OF BINUCLEAR AROMATIC MOLECULES : A DENSITY FUNCTIONAL THEORY STUDY , 1998 .