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    • 1. 发明申请
    • BIOASSAY DEVICE WITH OLED LIGHT SOURCE
    • WO2019122822A1
    • 2019-06-27
    • PCT/GB2018/053607
    • 2018-12-12
    • SUMITOMO CHEMICAL CO., LTDCAMBRIDGE DISPLAY TECHNOLOGY LTD.
    • WHEELER, May CatherineROBERTS, MatthewKAY, Chris
    • G01N21/63G01N33/53G01N33/558
    • G01N33/53G01N21/63G01N33/558
    • An assay device is described for determining the presence and/or concentration of a target analyte within a liquid transport path having a first end, a second end and a sample receiving portion proximate to the first end. The liquid transport path is configured to transport a liquid sample received in the sample receiving portion towards the second end. The assay device includes one or more organic light emitting diodes configured to illuminate a section of the liquid transport path located between the sample receiving portion and the second end. Each organic light emitting diode includes a first light emitting material which emits light centred around a first wavelength and a second light emitting material which emits light centred around a second wavelength. A ratio of emission intensity between the first and second light emitting materials varies in dependence upon a driving current supplied to the organic light emitting diode. The assay device also includes one or more photodetectors configured to receive light from the section of the liquid transport path illuminated by the organic light emitting diode. The assay device also includes a controller configured to drive the organic light emitting diode at a first driving current and obtain a first absorbance value based on the photodetector signal. The controller is also configured to drive the organic light emitting diode at a second driving current and obtain a second absorbance value based on the photodetector signal. The controller is also configured to determine the presence and/or concentration of a target analyte within the liquid transport path in dependence on a difference of the first and second absorbance values.