All-organic, Transparent Up-conversion Displays with Tailored Excitation and Emission Wavelengths

摘要

In this paper we describe the World's first all-organic, transparent, flexible, versatile color displays based upon triplet-triplet annihilation assisted photon up-conversion. The devices work with ultra-low excitation intensities down to 10 mWcm{sup}(-2) redear-IR light. The displays are based on metallated-porphyrin sensitizers in combination with emitters in a transparent matrix and are driven by galvano-scanned laser diodes. The displays have external quantum yield as high as 3.2%. The response time can be adjusted to specific application requirements - from a few μs to few 100 μs allowing kHz-refreshment rate of the displayed information. It is possible to easily tune the optical density of the screens in order to obtain a desired transmittance for the excitation beam. We demonstrate the ability to achieve multicolor emission, using only one excitation source. There are practically no display size limitations and it is a very simple, cost-effective fabrication.