Micropatterned Down-Converting Coating for White Bio-Hybrid Light-Emitting Diodes

Lukas Niklaus, Samira Tansaz, Haider Dakhil, Katharina T. Weber, Marlene Pröschel, Martina Lang, Monika Kostrzewa, Pedro B. Coto, Rainer Detsch, Uwe Sonnewald, Andreas Wierschem, Aldo R. Boccaccini*, Rubén D. Costa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


White hybrid light-emitting diodes (WHLEDs) are considered as a solid approach toward environmentally sustainable lighting sources that meet the “Green Photonics” requirements. Here, WHLEDs with protein-based down-converting coatings, i.e., Bio-WHLEDs, are demonstrated and exhibit worthy white color quality, luminous efficiency, and stability values. The coatings feature a multilayered cascade-like architecture with thicknesses of 1–3 mm. This limits the efficiency due to the low optical transmittance. Thus, submillimeter coatings, where the location of the proteins is well-defined, are highly desired. It is in this context where the thrust of this work sets in. Here, a straightforward way to design microstructured single-layer coatings, in which the proteins are placed at our command by using 3D printing, is presented. Based on comprehensive spectroscopic and rheological investigations, the optimization of the matrix and the plotting to prepare different micropatterns, i.e., lines, open-grids, and closed-grids, is rationalized. The latter are applied to prepare Bio-WHLEDs with ≈5-fold enhancement of the luminous efficiency compared to the reference devices with a cascade-like coating, without losing stability and color quality. As such, this work shows a new route to exploit proteins for optoelectronics, setting a new avenue of research into the emerging field of Bio-WHLEDs.

Original languageEnglish
Article number1601792
JournalAdvanced Functional Materials
Issue number1
Publication statusPublished - 2017 Jan 5
Externally publishedYes


  • 3D printing
  • bio-lighting sources
  • fluorescent proteins
  • micropatterned down-converting coating
  • protein-based hybrid light-emitting diodes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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