Electroluminescence- and electrically-detected magnetic resonance studies of spin one-half-polaron and singlet-exciton dynamics in multilayer small molecular organic light-emitting devices

Gang Li; Joseph Shinar

doi:10.1117/12.457465

27 February 2002 Electroluminescence- and electrically-detected magnetic resonance studies of spin one-half-polaron and singlet-exciton dynamics in multilayer small molecular organic light-emitting devices

Gang Li, Joseph Shinar

Author Affiliations +

Proceedings Volume 4464, Organic Light-Emitting Materials and Devices V; (2002) https://doi.org/10.1117/12.457465
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

The electroluminescence (EL)- and electrically-detected magnetic resonance (ELDMR and EDMR, respectively) of tris- (8-hydroxyquinoline) Al (Alq₃)]/[buffer]/Al-based organic light-emitting devices (OLEDs) are described. Positive spin ½ ELDMR and EDMR observed at T<60K are similar to the typical photoluminescence-detected magnetic resonance of (pi) -conjugated polymers, and consequently attributed to enhanced polaron recombination and consequent reduction of singlet exciton quenching by trapped and free polarons. A negative spin ½ EL- and current-quenching (negative) resonance is observed at T>=60 K. Its amplitude increases with T, and it is much stronger in devices with an AlO_x buffer layer than in those with a CsF buffer. Its behavior is consistent with magnetic resonance enhancement of the spin-dependent formation of dianions at the organic/cathode interface.

Citation Download Citation

Gang Li and Joseph Shinar "Electroluminescence- and electrically-detected magnetic resonance studies of spin one-half-polaron and singlet-exciton dynamics in multilayer small molecular organic light-emitting devices", Proc. SPIE 4464, Organic Light-Emitting Materials and Devices V, (27 February 2002); https://doi.org/10.1117/12.457465

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