Tunable near-UV microcavity organic light-emitting diodes (OLEDs) that emit in the deep blue and ultraviolet light region have been developed using a novel approach. These devices address the growing need for portable compact near-UV sources for analytical tools as well as various biomedical and forensic applications. These are among the first OLEDs that emit in the near-UV region. In this new approach, the team tuned the thickness of the spacer layer of a nanometer wide microcavity, allowing them to tailor each individual OLED in the array to the desired narrow-band emission. Simulations of the OLEDs’ emissions were used for analysis of the experimental data and informed device fabrication. The fabricated device was used as the excitation source in an all-organic oxygen sensor, which improved the sensor performance in comparison to the previously used green microcavity OLEDs. Moreover, an array of nine sharp-emitting OLEDs was employed in an all-organic on-chip spectrometer, a device for measuring light intensity, paving the way to compact plastic analytical tools.
Tunable Near UV Microcavity OLED Arrays: Characterization and Analytical Applications