A temperature sensor with a wide spectral range based on a dual-emissive TADF dendrimer system

Changfeng Si, Tao Wang, Yan Xu, Dongqing Lin, Dianming Sun () and Eli Zysman-Colman ()
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Changfeng Si: University of St Andrews
Tao Wang: University of St Andrews
Yan Xu: University of St Andrews
Dongqing Lin: Nanjing University of Posts and Telecommunications
Dianming Sun: University of St Andrews
Eli Zysman-Colman: University of St Andrews

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Dual emission from thermally activated delayed fluorescence (TADF) emitters is often difficult to observe, especially in solution, limited by Kasha’s rule. Two TADF dendrimers containing N-doped polycyclic aromatic hydrocarbons as acceptors are designed and synthesized. Compound 2GCzBPN, having a strongly twisted geometry, exhibits TADF, while 2GCzBPPZ, possessing a less twisted geometry, shows dual emission associated with the monomer and aggregate that is TADF. The demonstration reveals that 2GCzBPPZ can serve as a temperature sensor with excellent temperature sensitivity and remarkably wide emission color response in solution. By embedding 2GCzBPPZ in paraffin we demonstrate a spatial-temperature sensor that shows a noticeable emission shift from yellow to green and ultimately to blue as the temperature increases from 20 to 200 °C. We finally demonstrate the utility of these TADF dendrimers in solution-processed organic light-emitting diodes.

Date: 2024
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DOI: 10.1038/s41467-024-51231-x

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