Measuring the Light Efficiency of Organic LEDs/OLEDs

Task

Long-time data aquisition at up to 120 OLEDs simultaneously. Determination of light intensity and resulting light efficiency of each OLED separately. Assembly of the test bed into a climatic chamber for simulation of several climatic conditions and for defined climatic stress of the test samples.

Requirements

  • Measurement data aquisition with 240 channels (2 channels for each OLED)
  • Semiautomatic calibration of equal light intensity of the OLEDs before test run
  • Verification and saving the data on the computer
  • Graphical visualization of the measurement data (during measurement or off-line)
  • PASS/FAIL-Checking by measuring the light intensity divergence
  • Simple adaption of the software for future requirements
  • Taking out of test samples during test run for analytical purposes
  • Off-line data analysis with commercial software
LabVIEW Application

Solution

Software development and programming in LabVIEW (National Instruments). Data acquisition with DMM 2010 and Switch Mainframe 7002 (Keithley Instruments) via GPIB. Use of ambitious graphic visualizing possibilities (OLED selection, ZoomIn, ZoomOut). Evaluated measurement data are saved as spreadsheet ASCII file.