Novaled and Colnatec improve OLED production test

Novaled and Colnatec improve OLED production test

Business news |
By eeNews Europe

With the advent of organic electronics, the effect of temperature during deposition became a topic due to unique film growth variables of organic materials. The measurement of the physical thickness of an OLED layer, typically in the nanometre range, is a function of the temperature of the sensor and substrate being coated. Unless temperature is accounted for and equalized, thickness accuracy will suffer significantly, leading to inconsistencies as great as 50% per layer. Organic materials such as AlQ3 are not a ‘flat film’ like many optical films, yet other commercially available sensors treat them as such. Heating a sensor and controlling it reduces stress and relaxes the film, and also allows for ‘baking off’ accumulated material, thereby extending sensor lifetime, a critical factor for cost efficiency in long, continuous runs.

According to Colnatec CTO Scott Grimshaw, the company’s film thickness monitoring system “Tempe” was developed to stabilize OLED device performances, for its material characterization capabilities, and for in-situ, self-regeneration properties. It can increase run-time, decrease downtime, and reduce overall costs.

“OLEDs absolutely need accurate layer sizes," explains Kai Gilge, Head of Novaled’s Engineering Division. "Without temperature compensation, the device performance is directly affected,” He added that Colnatec’s sensor system will help to cut development time for OLED prime materials.

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