Measuring the Efficiency of Organic Light‐Emitting Devices

As organic light‐emitting devices emerge from the stage of being a research curiosity to that of becoming a practical appliance with important commercial applications, the need for a coherent and accurate standard technique for measuring device efficiencies becomes increasingly important. By following the methods described in this contribution, measurements made in disparate laboratories testing a wide range of materials and device structures should agree, to within small experimental errors, on the properties of the subject devices.