Highly efficient organic light-emitting diodes from delayed fluorescence

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The Paper of Prof. Chihaya ADACHI(I²CNER Hydrogen Production Research Division) was published in “Nature” on December 13, 2012.


<Title of Paper>

“Third generation organic light emitting materials for use in OLEDs” 


Prof. ADACHI has successfully developed third generation light-emitting materials for use in organic light emitting diodes (OLEDs). These materials have a unique molecular design that reduces the energy gap between triplet and singlet excited states, providing a novel efficient excition formation mechanism, i.e., thermally activated delayed fluorescence (TADF). In these systems, TADF allows a light emission efficiency of nearly 100% from the almost complete convewrsion of electrons into photos under electrical excitation. First generation organic fluorescent materials and second generation phosphorescent materials are widely used in OLEDs, but the former are limited by low efficiency and the latter by expense. The freedom of molecular design led to the production of an ultimate emitter that realizes both high efficiency and low cost without using rare metals. We call this new luminescence concept “hyperfluorescence”. The results of this research have been published in the online version of “Nature” on the 13th of December, 2012.


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Prof. Chihaya ADACHI