Solution processable high band gap hosts based on carbazole functionalized cyclic phosphazene cores for application in organic light‐emitting diodes |
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| Authors: | Mui Siang Soh Sonsoles Amor Garcia Santamaria Evan Laurence Williams Marta Pérez‐Morales Henk J Bolink Alan Sellinger |
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| Institution: | 1. Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), Singapore 117602, Singapore;2. Instituto de Ciencia Molecular (ICMol), Universidad de Valencia, P.O. Box 22085, Valencia 46071, Spain;3. Department of Physical Chemistry and Applied Thermodynamics, University of Cordoba, Campus de Rabanales, Ed. Marie Curie, Cordoba E‐14071, Spain;4. Department of Materials Science and Engineering, Center for Advanced Molecular Photovoltaics (CAMP), Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305‐4045 |
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| Abstract: | A new class of solution processable dendrimers based on cyclic phosphazene (CP) cores have been prepared and used as host materials for blue and green organic light emitting diodes (OLEDs). The dendrimers are prepared in high yield from minimal step reactions, are soluble in common solvents for solution processing, are amorphous, and have excellent thermal properties necessary for application in OLEDs. OLED efficiencies of 10.3 cd/A (4.2 lm/W) and 35.3 cd/A (33.5 lm/W) were achieved using commercially available FIrpic and Ir(mppy)3 as blue and green phosphorescent emitters, respectively. These efficiencies were 2× higher than control devices prepared using poly(N‐vinylcarbazole), the most commonly used host material in solution processed phosphorescent OLEDs. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 |
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| Keywords: | charge transport conducting polymers dendrimers organic electronics organic light‐emitting diodes photoluminescence polyphosphazenes solution processable |
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