Spectrally narrowed edge emission from leaky waveguide modes in OLEDs

Z. Q. Gan; Y. Tian; D. W. Lynch; Ji-hun Kang; Q-Han Park; J. Shinar

doi:10.1117/12.739247

16 October 2007 Spectrally narrowed edge emission from leaky waveguide modes in OLEDs

Z. Q. Gan, Y. Tian, D. W. Lynch, Ji-hun Kang, Q-Han Park, J. Shinar

Proceedings Volume 6655, Organic Light Emitting Materials and Devices XI; 66550K (2007) https://doi.org/10.1117/12.739247
Event: Photonic Devices + Applications, 2007, San Diego, California, United States

Abstract

A dramatic spectral line narrowing of the edge-emission, at room temperature, from tris(quinolinolate) Al (Alq₃), N,N'-diphenyl-N,N'-bis(1-naphthylphenyl)-1,1'-biphenyl-4,4'-diamine (NPD), 4,4'-bis(2,2'-diphenyl- vinyl)-1,1'- biphenyl (DPVBi), and some guest-host small molecular OLEDs, fabricated on ITO-coated glass, is described. In all but the DPVBi OLEDs, the narrowed emission band emerges above a threshold thickness of the emitting layer, and narrows down to a full width at half maximum of only 5 - 10 nm. The results demonstrate that this narrowed emission is due to irregular waveguide modes that leak from the ITO to the glass substrate at a grazing angle. While measurements of variable stripe length (l) devices exhibit an apparent weak optical gain, there is no observable threshold current or bias associated with this spectral narrowing. It is suspected that the apparent weak optical gain is due to misalignment of the axis of the waveguided mode and the axis of the collection lens of the probe, but it is not clear if such a misalignment can account for the for the observed evolution of the edge emission spectra with l.

Citation Download Citation

Z. Q. Gan, Y. Tian, D. W. Lynch, Ji-hun Kang, Q-Han Park, and J. Shinar "Spectrally narrowed edge emission from leaky waveguide modes in OLEDs", Proc. SPIE 6655, Organic Light Emitting Materials and Devices XI, 66550K (16 October 2007); https://doi.org/10.1117/12.739247

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