Prof. Chi and his team research on polyatomic molecules published in Nature Photonics

Low-energy emission of organic molecules is typically hampered by exciton-vibration coupled deactivations, known as the energy gap law. Now, its influence can be circumvented using: (i) exciton delocalization to reduce reorganization energy and (ii) H-D substitution to reduce high frequency C-H vibrations. Hence, photoluminescence with max. at ~1000 nm and quantum yield of 23 ± 0.3% was obtained. This NIR OLED gave a peak wavelength of 995 nm, maximum external quantum efficiency of 4.31%, and radiance of 1.55 W Sr-1 m-2 at 10 mA cm-2, marking a new milestone for the studies.

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