We report what we believe to be the first use of organic nanostructures for efficient colour conversion of gallium nitride light emitting diodes (LEDs). The particular nanomaterials, based on star-shaped truxene oligofluorenes, offer an attractive alternative to inorganic colloidal quantum dots in the search for novel and functional 'nanophosphors'. The truxenes have been formed into a composite with photoresist and ink-jet printed onto microstructured gallium nitride LEDs, resulting in a demonstrator hybrid microdisplay technology with pixel size ~32μm. The output power density of the hybrid device was measured to be ~8.4mW/cm2 per pixel at driving current density of 870.8A/cm2 and the efficiency of colour conversion at drive current of 7mA was estimated to be approximately 50%.
- light-emitting devices
- ink-jet printing
- organic nanostructures
Wu, M., Gong, Z., Keuhne, A. J. C., Kanibolotsky, A., Chen, Y., Perepichka, I. F., ... Dawson, M. (2009). Hybrid GaN/organic microstructured light-emitting devices via ink-jet printing. Optics Express, 17(19), 16436-16443. https://doi.org/10.1364/OE.17.016436