Degradation of wide band-gap electrolumienscent materials by exciton-polaron interactions (Presentation Recording)

Hany Aziz; Qi Wang

doi:10.1117/12.2187247

5 October 2015 Degradation of wide band-gap electrolumienscent materials by exciton-polaron interactions (Presentation Recording)

Hany Aziz, Qi Wang

Author Affiliations +

Proceedings Volume 9566, Organic Light Emitting Materials and Devices XIX; 95660V (2015) https://doi.org/10.1117/12.2187247
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States

Abstract

The limited performance stability and gradual loss in the electroluminescence efficiency of OLEDs utilizing wide band-gap materials, such as blue-emitting phosphorescent and fluorescent devices, continues to be a challenge for wider technology adoption. We recently found that interactions between excitons and polarons play an important role in the aging behavior of electroluminescent materials, and that a correlation exists between the susceptibility of these materials to this aging mode and their band-gap. This degradation mode is also found to be often associated with the emergence of new bands - at longer wavelength - in the electroluminescence spectra of the materials, that can often be detected after prolonged electrical driving. Such bands contribute to the increased spectral broadening and color purity loss often observed in these devices over time. Exciton-polaron interactions, and the associated degradation, are also found to occur most significantly in the vicinity of device inter-layer interfaces such as at the interface between the emitter layer and the electron or hole transport layers. New results obtained from investigations of these phenomena in a wide range of commonly used host and guest OLED materials will be presented.

Conference Presentation

Citation Download Citation

Hany Aziz and Qi Wang "Degradation of wide band-gap electrolumienscent materials by exciton-polaron interactions (Presentation Recording)", Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 95660V (5 October 2015); https://doi.org/10.1117/12.2187247

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
PRESENTATION

WATCH
PRESENTATION SAVE TO MY LIBRARY

GET CITATION

KEYWORDS

Electroluminescence

Interfaces

Organic light emitting diodes

Electron transport

Excitons

Polarons

Current controlled current source

Show All Keywords

Keywords/Phrases

Search In:

Publication Years