Patent ID: 8242461

Claim:
An integrated test element for detecting at least one analyte in a sample, in particular in a liquid sample, comprising: a carrier element, wherein at least one organic electroluminescent component, in particular at least one organic electroluminescent thin-film component, in particular at least one organic light-emitting diode (OLED), is applied on an application face of the carrier element, wherein the integrated test element furthermore comprises at least one photodetector element, wherein the integrated test element comprises at least one indicator substance that is at least partially integrated into at least one organic layer of the at least one organic electroluminescent component, wherein the at least one organic layer is a layer of a sandwich structure of the organic electroluminescent component and is part of one or more organic layers which are embedded between electrodes of the organic electroluminescent component such that the indicator substance is positioned between the electrodes of the organic electroluminescent component, wherein the at least one organic electroluminescent component is designed in such a way that at least some of the excitation light emitted by it reaches the at least one indicator substance, wherein the at least one indicator substance is designed to alter at least one optical characteristic, in particular an emission characteristic, in particular a fluorescence characteristic, when the at least one indicator substance comes into contact with the at least one analyte, wherein the integrated test element furthermore comprises at least one reference device which is designed to alter at least one optical characteristic, in particular at least one of a reflection characteristic and an emission characteristic, in particular a fluorescence characteristic, depending on the intensity of the excitation light emitted by the at least one organic electroluminescent component, and wherein the alteration of the at least one optical characteristic is at least substantially independent of the presence or absence of the at least one analyte.