The final symposium of the OLLA OLED lighting project took place on the High Tech Campus in Eindhoven Netherlands 12.6.08 with about 80 attending the exhibition and about 60 attending the half day conference. The objective is to start the work that will lead to replacement of many of the “6 billion lights that the world buys every year”. Presentations from OLLA, Siemens, Novaled, Fraunhofer IPMS, Philips Lighting OLED Development and Royal Philips Electronics and the exhibition alongside revealed that the objectives had been met or exceeded. These objectives embraced laboratory demonstration of sharply improved life for 1000 cd/m2 emission and larger panel size etc, compared to what was available when the project was conceived five years ago.
The contrast with OLLA majoring on small molecule OLEDs is partly explained by the fact that this project was pre-competitive research looking for best performance not best marketability, flexibility, price or other criterion. An interesting aspect revealed in discussions was the fact that the division beteeen small and large molecule options is breaking down with printing small molecule precursors that are cured into small molecules and, more recently, focus on slightly larger small molecule oligomers that cannot be sublimated but can be printed. Some side chains can also help in this respect. However, the effect of even minor changes of molecule on electrical, optical and rheological properties is highly complex and not fully understood.
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