(color online): Photos of two 8 mm x 10 mm sized OLEDs.

Contexts in source publication

Context 1

... gray. On the other hand, joule heating may partly destroy the organic compounds of the device. During the metallization process the shadow mask stays in thermal contact with the substrate. During this process, the mask gets warm enough to change the organic compound on its outside margins, leading to an inhomogeneous luminance. This is shown in Fig. 2a with inhomogeneous luminance in the upper left corner of the active area. Using a spacer between shadow mask and substrate, one can reduce this thermal intake to almost zero. This is shown in Fig. 2b. ...

Context 2

... process, the mask gets warm enough to change the organic compound on its outside margins, leading to an inhomogeneous luminance. This is shown in Fig. 2a with inhomogeneous luminance in the upper left corner of the active area. Using a spacer between shadow mask and substrate, one can reduce this thermal intake to almost zero. This is shown in Fig. 2b. ...

Context 3

... a cooling shroud on the outer side of the chamber that was realized by a couple of tubes filled with cooling water. In the same way, we obtained a constant thermal gradient along the power connectors [7]. cooled chamber walls During a metallization process, the shadow mask can get hot enough, to influence the device performance, like shown in Fig. 2a. To avoid this problem, we implemented little spacers between the shadow mask and the substrate, eliminating thermal contact between the active area and the stainless steel. So the shadow mask works like an additional thermal shield, lowering the substrate temperature by nearly a quarter to a maximum of 75 °C, shown in Fig. ...