Long-living and highly efficient bio-hybrid light-emitting diodes with zero-thermal-quenching biophosphors

Anna Espasa, Martina Lang, Carmen F. Aguiño, Daniel Sanchez-deAlcazar, Juan P. Fernández-Blázquez, Uwe Sonnewald, Aitziber L. Cortajarena, Pedro B. Coto and Rubén D. Costa ()
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Anna Espasa: IMDEA Materials Institute, Calle Eric Kandel 2
Martina Lang: Friedrich-Alexander-University of Erlangen-Nuremberg
Carmen F. Aguiño: IMDEA Materials Institute, Calle Eric Kandel 2
Daniel Sanchez-deAlcazar: Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA)
Juan P. Fernández-Blázquez: IMDEA Materials Institute, Calle Eric Kandel 2
Uwe Sonnewald: Friedrich-Alexander-University of Erlangen-Nuremberg
Aitziber L. Cortajarena: Center for Cooperative Research in Biomaterials (CIC biomaGUNE), Basque Research and Technology Alliance (BRTA)
Pedro B. Coto: University of Oviedo
Rubén D. Costa: IMDEA Materials Institute, Calle Eric Kandel 2

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Bio-hybrid light-emitting diodes (Bio-HLEDs) based on color down-converting filters with fluorescent proteins (FPs) have achieved moderate efficiencies (50 lm/W) and stabilities (300 h) due to both thermal- and photo-degradation. Here, we present a significant enhancement in efficiency (~130 lm/W) and stability (>150 days) using a zero-thermal-quenching bio-phosphor design. This is achieved shielding the FP surface with a hydrophilic polymer allowing their homogenous integration into the network of a light-guiding and hydrophobic host polymer. We rationalize how the control of the mechanical and optical features of this bio-phosphor is paramount towards highly stable and efficient Bio-HLEDs, regardless of the operation conditions. This is validated by the relationships between the stiffness of the FP-polymer phosphor and the maximum temperature reached under device operation as well as the transmittance of the filters and device efficiency.

Date: 2020
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DOI: 10.1038/s41467-020-14559-8

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