Physical characterizations of direct and inverted solution-processed organic light-emitting diodes

Y. Murat; G. Wantz; S. Fasquel; J.-Y. Laurent; T. Maindron; L. Hirsch

doi:10.1117/12.2237585

23 September 2016 Physical characterizations of direct and inverted solution-processed organic light-emitting diodes

Y. Murat, G. Wantz, S. Fasquel, J.-Y. Laurent, T. Maindron, L. Hirsch

Proceedings Volume 9941, Organic Light Emitting Materials and Devices XX; 994129 (2016) https://doi.org/10.1117/12.2237585
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

In this study, direct and inverted OLEDs (iOLEDs) were fabricated by using the polymer Super Yellow (SY) as the emissive material. By adding a 5 nm-thick layer of polyethylenimine ethoxylated (PEIE) on top of ITO/ZnO (indium tin oxide/zinc oxide) in the iOLEDs, its cathode work function was reduced of 1 eV. A thin layer of 1,3,5-tris(Nphenylbenzimidazol- 2-yl)benzene (TPBi) was further added by wet-process in the iOLEDs, blocking the holes at the PEIE/SuperYellow interface, so that the iOLEDs could finally reach much higher luminance compared to the direct OLEDs, maximum 40 000 cd/m², with a constant maximum efficiency of 15 cd/A (13 cd/A maximum for the direct OLEDs). Temperature dependent transient electroluminescence measurements were conducted in order to compare charge carriers mobilities and disorder in direct OLEDs and iOLEDs. It was shown that the holes mobilities are higher for direct OLEDs (4 10^-6 cm^²/(V.s)) than iOLEDs (1.5 10^-6 cm^²/(V.s)) while the width of the distribution of energy states (DOS), σ, and the positional disorder parameter, Σ, are comparable for both structures.

Citation Download Citation

Y. Murat, G. Wantz, S. Fasquel, J.-Y. Laurent, T. Maindron, and L. Hirsch "Physical characterizations of direct and inverted solution-processed organic light-emitting diodes", Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994129 (23 September 2016); https://doi.org/10.1117/12.2237585

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