Congratulations to our customer, Professor Chien-Hong Cheng and the rest of the team at the National Tsing Hua University in Taiwan for the publication of their paper “Diboron Compound-Based Organic Light Emitting Diodes with High Efficiency and Reduced Efficiency” in Nature Photonics.

Prof. Cheng’s team used an Edinburgh Instruments FLS980 Photoluminescence Spectrometer with a gated PMT detector to measure the time resolved emission spectra of a new diboron based green emitter for high efficiency organic light emitting diodes (OLEDs).

The material developed by Prof. Cheng exploits a mechanism known as Thermally Activated Delayed Fluorescence (TADF) which allows triplet excitons to be converted to singlet excitons through a thermally assisted reverse intersystem crossing. This enables the normally non-emissive triplet excitons to be harvested, and the internal quantum efficiency of the OLED increased from 25% to 100% without the need for the rare and expensive heavy metals that are used in current OLED designs. Using TADF, they created a green OLED with a high external quantum efficiency of 37.8% and CIE coordinates of (0.31, 0.61) making it a promising emitter for OLED display applications.

The full paper is available on the website of Nature Photonics.

For more information on the significance of the work of Prof.Cheng and the theory behind TADF, read our introductory article ‘What is Thermally Activated Delayed Fluorescence?‘

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