Bringing UV excitation of small molecules and nano-structures to another level - pulsed high-power UV-LEDs with more than 40 times higher output power
Christian Oelsner a, Eugeny Ermilov a, Volker Buschmann a, Frank Birke a, Rainer Erdmann a
a PicoQuant GmbH, Rudower Chaussee 29, D-12489 Berlin, Germany
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
València, Spain, 2022 May 19th - 25th
Organizers: Pablo Docampo, Eva Unger and Elizabeth Gibson
Poster, Christian Oelsner, 250
Publication date: 20th April 2022

In addition to steady-state fluorescence investigations, time-resolved photoluminescence measurements with pulsed light sources are a powerful tool to get more information about the nature, characteristics and environment of molecules and nano-structures. Their emission lifetime can be affected by various processes such as Energy Transfer (ET), charge transfer, or molecular orientation and interfaces.

The spectral region between 260 – 340 nm is significant for biology, life and materials science, as many organic and inorganic molecules and structures can be excited in this range. Whereas the photoluminescence and lifetime of these materials is very sensitive to molecule interactions or changes in it’s structure and composites.

Here we present the differences in steady state and time-resolved photoluminescence measurements when using a regular pulsed UV-LED and new pulsed high-power UV-LED with a photoluminescence spectrometer. Next to the significant enhanced photoluminescence signal by a factor of 100x, we can use the same pulsed UV-LED to detect emission lifetimes even up to milliseconds in a few minutes, which is not possible with regular pulsed LEDs.

Using these new pulsed high-power UV-LEDs for UV-absorbing nano-structures and small molecule excitation allows investigating really low concentrated solutions, thin films and even powders with short acquisition times both in steady-state as well as time-resolved measurements from picoseconds up to milliseconds.


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