Organic light-emitting diode based fluorescence-linked immunosorbent assay for SARS-CoV-2 antibody detection

Cheng Lian, Dan Frushard Young, Richard Edward Randall, Ifor D. W. Samuel*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Immunodiagnostics have been widely used in the detection of disease biomarkers. The conventional immunological tests in central laboratories require expensive equipment and, for non-specialists, the tests are technically demanding and time-consuming, which has prevented their use by the public. Thus, point-of-care tests (POCT), such as lateral flow immunoassays, are being, or have been, developed as more convenient and low-cost methods for immunodiagnostics. However, the sensitivity of such tests is often a concern. Here, a fluorescence-linked immunosorbent assay (FLISA) using organic light-emitting diodes (OLEDs) as excitation light sources was investigated as a way forward for the development of compact and sensitive POCTs. Phycoerythrin (PE) was selected as the fluorescent dye, and OLEDs were designed with different emission spectra. The leak-age light of different OLEDs for exciting PE was then investigated to reduce the background noise and improve the sensitivity of the system. Finally, as proof of principle that OLED-based technology can be successfully further developed for POCT, antibody to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in human serum was detected by OLED-FLISA.
Original languageEnglish
Article number1125
Number of pages13
Issue number12
Publication statusPublished - 5 Dec 2022


  • Organic semiconductor
  • OLED
  • Sensing
  • Point-of-care testing


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