Improved lifetime and efficiency of green organic light-emitting diodes with a fluorescent dye (C545T)-doped hole transport layer

Hwan-Seok Bang; Jinyoung Yun; Changhee Lee

doi:10.1117/12.735096

16 October 2007 Improved lifetime and efficiency of green organic light-emitting diodes with a fluorescent dye (C545T)-doped hole transport layer

Hwan-Seok Bang, Jinyoung Yun, Changhee Lee

Author Affiliations +

Proceedings Volume 6655, Organic Light Emitting Materials and Devices XI; 66551W (2007) https://doi.org/10.1117/12.735096
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

We report the improvement of the electroluminescence (EL) efficiency and the device stability of green organic light-emitting diodes (OLEDs) by doping 10-(2-benzothiazolyl)-2,3,6,7-tetramethyl-1H,5H,11H-(1)- benzopyropyrano(6,7-8-i,j)quinolizin-11-one (C545T) in the thin interfacial region of the hole transporting layer of N,N'-di(1-naphthyl) -N,N'-diphenylbenzidine (α-NPD) in addition to the tris(8-hydroxyquinoline) aluminum (Alq₃) emitting layer. The EL efficiency of 15.7 cd/A is obtained at 10 mA/cm², which is about 10 % higher than the device with C545T doped only in the Alq3 layer. In addition, the longer lifetime with very small driving voltage variation over time is obtained under a constant current driving. This improvement in the efficiency and stability can be attributed to the combined effect of an additional radiative recombination of electrons with holes in the C545T-doped α-NPD layer and the reduced transport of holes into the Alq₃ emitting layer, thus lowering the generation of unstable Alq₃ cationic species (Alq₃⁺).

Citation Download Citation

Hwan-Seok Bang, Jinyoung Yun, and Changhee Lee "Improved lifetime and efficiency of green organic light-emitting diodes with a fluorescent dye (C545T)-doped hole transport layer", Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 66551W (16 October 2007); https://doi.org/10.1117/12.735096

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