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Video: OLED Testing Guide


 

This guide gives an overview of what to consider when characterising an OLED, as well as tips for their measurement.

In particular, this video tutorial shows an OLED testing procedure where the OLED performance is measured using a (third-party) luminance meter. To characterise our OLEDs, we use our IV Curve Measurement System, which comprises of an Ossila Source Measure Unit with a Push-Fit Test Board.

To acquire the data, we use a Python script written using the Xtralien Scientific Python distribution.

For a full description, please see the written OLED Testing Guide on Ossila website.

 

Video Transcript

In this video we will show you how to test your OLED devices and measure their lifetime.

To test the OLEDs, we are using an Ossila Push-Fit Test Board (E401) with ITO Substrates for OLEDs/Pixelated Anode (S101). These are controlled with an Xtralien X100 source measure unit (SMU).

You can secure the X100 to a breadboard or bench. The X100 can be connected via a USB or a network cable. The USB plugs into your PC and the network cable connects to a router.

The current range of the X100 can be manually switched to adjust the maximum current value resolution of the measurements. Here, Range 2 is selected due to our pixel size. For details of current ranges, visit the Source Measure Unit product page.

Load your device into the test board connected to the X100 SMU. The pixels increase in brightness as the voltage is increased.

The manual board is held in place and aligned with the (third party) luminance meter, which is connected to the PC. The luminance meter is aligned with the pixel to be measured. Example: voltage sweep is being applied to one pixel. Once the luminance meter has been positioned, shield the setup from stray ambient light.

Acquire data using your preferred experimental parameters and software. We are using a script written in the Xtralien Scientific Python distribution. The settings in the script (port, file and directory locations and the sweep settings) are checked before it is run.

The Xtralien X100 applies the voltage and measures the current while the luminance meter collects the light emitted from the pixel in cd/m2. The script then calculates the efficiencies and finds the turn ON voltage. The raw data (voltage, current and brightness) are saved in a CSV file.