Alkali metal sources for OLED devices

Lorena Cattaneo; Giorgio Longoni; Antonio Bonucci; Stefano Tominetti

doi:10.1117/12.634736

29 July 2005 Alkali metal sources for OLED devices

Lorena Cattaneo, Giorgio Longoni, Antonio Bonucci, Stefano Tominetti

Proceedings Volume 5961, Building European OLED Infrastructure; 59610A (2005) https://doi.org/10.1117/12.634736
Event: Workshop on Building European OLED Infrastructure, 2005, Cambridge, United Kingdom

Abstract

In OLED organic layers electron injection is improved by using alkali metals as cathodes, to lower work function or, as dopants of organic layer at cathode interface. The creation of an alkali metal layer can be accomplished through conventional physical vapor deposition from a heated dispenser. However alkali metals are very reactive and must be handled in inert atmosphere all through the entire process. If a contamination takes place, it reduces the lithium deposition rate and also the lithium total yield in a not controlled way. An innovative alkali metal dispensing technology has been developed to overcome these problems and ensure OLED alkali metal cathode reliability. The alkali Metal dispenser, called Alkamax, will be able to release up to a few grams of alkali metals (in particular Li and Cs) throughout the adoption of a very stable form of the alkali metal. Lithium, for example, can be evaporated “on demand”: the evaporation could be stopped and re-activated without losing alkali metal yield because the metal not yet consumed remains in its stable form. A full characterization of dispensing material, dispenser configuration and dispensing process has been carried out in order to optimize the evaporation and deposition dynamics of alkali metals layers. The study has been performed applying also inside developed simulations tools.

Citation Download Citation

Lorena Cattaneo, Giorgio Longoni, Antonio Bonucci, and Stefano Tominetti "Alkali metal sources for OLED devices", Proc. SPIE 5961, Building European OLED Infrastructure, 59610A (29 July 2005); https://doi.org/10.1117/12.634736

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available