Phosphorescent light-emitting transistors: harvesting triplet excitons

Ebinazar B Namdas; Ben B Y Hsu; Zehua Liu; Shih-Chun Lo; Paul L Burn; Ifor D W Samuel

doi:10.1002/adma.200900919

Phosphorescent light-emitting transistors: harvesting triplet excitons

Adv Mater. 2009 Dec 28;21(48):4957-4961. doi: 10.1002/adma.200900919. Epub 2009 Aug 24.

Authors

Ebinazar B Namdas¹, Ben B Y Hsu¹, Zehua Liu², Shih-Chun Lo³, Paul L Burn³, Ifor D W Samuel^{1

4}

Affiliations

¹ Center for Polymers and Organic Solids, University of California Santa Barbara, CA 93106 (USA).
² Department of Chemistry, Chemical Research Laboratory University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK).
³ Centre for Organic Photonics and Electronics School of Chemistry and Molecular Biosciences The University of Queensland Chemistry Building, QLD 4072 (Australia).
⁴ Organic Semiconductor Centre, SUPA School of Physics and Astronomy, University of St Andrews North Haugh, St Andrews, Fife, KY16 9SS (UK).

PMID: 25376509
DOI: 10.1002/adma.200900919

Abstract

Phosphorescent light-emitting transistors, in which light emission from singlet and triplet energy levels is harvested using solution-processed materials, are presented. While a green phosphorescent dendrimer exhibits an external quantum efficiency of 0.45% at 480 cd m(-2) , a red polymer/phosphorescent small-molecule blend produces a brightness exceeding 30 cd m(-2) with a relatively high hole mobility of 2.5 × 10(-2) cm(2) V(-1) s(-1) .

Keywords: Light-emitting diodes; Organic electronics; Organic field-effect transistors; Photoluminescence.