DOI: https://doi.org/10.29363/nanoge.aohm.2019.029
Publication date: 8th January 2019
While the demonstration of the first OLED emitting thermally activated delayed fluorescence (TADF) in Advanced Materials in 2009 by our group gave a glimpse of TADF's potential, our successive report in Nature in 2012 of a TADF-based OLED with an internal quantum efficiency of nearly 100% grabbed the attention of researchers world-wide and established TADF as a truly promising technology. After the quick review of recent progress on TADF OLEDs with RGB and NIR emission, we will introduce our recent efforts to inject high current density, reduce rolloff related to Joule heating and various exciton annihilation processes and control excited-state absorption for the realization of electrically pumped organic semiconductor laser diodes. By managing these issues, we report low-threshold surface-emitting organic distributed feedback lasers operating under continuous-wave photoexcitation. Further, we mention future current driven organic semiconductor laser diodes (OSLDs) by engineering fluorescence-based emitters with the combination of DFB structures that can well confine charge carriers, exciton and light simultaneously.
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