期刊
ADVANCED FUNCTIONAL MATERIALS
卷 29, 期 42, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201904356
关键词
bio-hybrid light-emitting diodes; color down-converting filters; fluorescent proteins; hybrid light-emitting diodes; thermal and photo-deactivation mechanisms
类别
资金
- program Ayudas para la atraccion de talento investigador-Modalidad 1, of the Consejeria de Educacion, Juventud y Deporte-Comunidad de Madrid [2016-T1/IND-1463]
- Spanish MINECO [RYC-2016-20891]
- Europa Excelencia program [ERC2019-092825]
- BBVA Foundation
- Madrid region [P2018/NMT-4367]
- Regional Council for Industry and Employment of the Principality of Asturias
- European Regional Development Fund (ERDF)
- Spanish Ministry of Science, Innovation and Universities [PGC2018-095953-B-I00]
- Spanish State Research Agency [MDM-2017-0720]
- European Research Council [ERC-CoG-648071-ProNANO]
- Spanish Ministry of Economy and Competitiveness [BIO2016-77367-R]
- Basque Government [Elkartek KK-2017/00008]
- HYNANOSC [RTI2018-099504-A-C22]
Color down-converting filters with fluorescent proteins (FPs) embedded in a polymer matrix have led to new bio-hybrid light-emitting diodes (Bio-HLEDs), featuring stabilities of 100 h and <1 min at low and high applied currents, respectively. Herein, the FP deactivation mechanism in Bio-HLEDs at high driving currents is deciphered. Primarily, the nonradiative energy relaxation of FPs upon excitation promotes the release of excess energy to the polymer matrix, reaching 60 degrees C and, in turn, a significant thermal emission quenching. This is circumvented by changing the device architecture, achieving stabilities of >300 h at high driving currents. Here, the photoinduced deactivation mechanism takes place, consisting of a slow and reversible partial dehydration followed by a quick and irreversible deactivation of the highly emissive ionic form. This is supported by steady-state/time-resolved emission, circular dichroism, and electrochemical impedance spectroscopic techniques. Overall, the limitations of Bio-HLEDs concerning matrix, buffers, device design, and FP stability are highlighted as key aspects to achieve efficient and stable devices.
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