Title

Intense deep blue exciplex electroluminescence from NPB/TPBi:PPh3O-based OLEDs and their intrinsic degradation mechanisms (Conference Presentation)

Campus Units

Chemistry, Physics and Astronomy, Microelectronics Research Center (MRC)

Document Type

Presentation

Conference

SPIE Organic Photonics + Electronics

Publication Version

Published Version

Publication Date

11-4-2016

Journal or Book Title

Proceedings of SPIE

Volume

9941

First Page

994106

DOI

10.1117/12.2238816

Conference Title

Organic Light Emitting Materials and Devices XX

Conference Date

August 28, 2016

City

San Diego, CA

Abstract

We describe intense and efficient deep blue (430 – 440 nm) exciplex emission from NPB/TPBi:PPh3O OLEDs where the luminous efficiency approaches 4 Cd/A and the maximal brightness exceeds 22,000 Cd/m2. Time resolved PL measurements confirm the exciplex emission from NPB:TPBi, as studied earlier by Monkman and coworkers [Adv. Mater. 25, 1455 (2013)]. However, the inclusion of PPh3O improves the OLED performance significantly. The effect of PPh3O on the EL and PL will be discussed. The NPB/TPBi:PPh3O-based OLEDs were also studied by optically and electrically detected magnetic resonance (ODMR and EDMR, respectively). In particular, the amplitude of the negative (EL- and current-quenching) spin 1/2 resonance, previously attributed to enhanced formation of strongly EL-quenching positive bipolarons, increases as the OLEDs degrade in a dry nitrogen atmosphere. This degradation mechanism is discussed in relation to degradation induced by hot polarons that are energized by exciton annihilation.

Comments

This is a presentation published as Joseph Shinar, Chamika Hippola, Dusan Danilovic, Ujjal Bhattacharjee, Jacob W. Petrich, Ruth Shinar, "Intense deep blue exciplex electroluminescence from NPB/TPBi:PPh3O-based OLEDs and their intrinsic degradation mechanisms (Conference Presentation)", Proc. SPIE 9941, Organic Light Emitting Materials and Devices XX, 994106 (4 November 2016); doi: 10.1117/12.2238816. Posted with permission.

Copyright Owner

Society of Photo-Optical Instrumentation Engineers (SPIE)

Language

en

File Format

application/vnd.apple.mpegurl

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