White top-emitting organic light-emitting diodes with solution-processed nano-particle scattering layers | Zendy

Tim Schaefer | Zendy; Tobias Schwab | Zendy; Simone Lenk | Zendy; Malte C. Gather | Zendy

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White top-emitting organic light-emitting diodes with solution-processed nano-particle scattering layers

Author(s) -

Tim Schaefer,

Tobias Schwab,

Simone Lenk,

Malte C. Gather

Publication year - 2015

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4937004

Subject(s) - oled , scattering , materials science , optoelectronics , light scattering , quantum efficiency , diode , mie scattering , light emitting diode , optics , particle (ecology) , layer (electronics) , particle size , chemistry , nanotechnology , physics , oceanography , geology

A random scattering approach to enhance light extraction in white top-emitting organic light-emitting diodes (OLEDs) is reported. Through solution processing from fluorinated solvents, a nano-particle scattering layer (NPSL) can be deposited directly on top of small molecule OLEDs without affecting their electrical performance. The scattering length for light inside the NPSL is determined from transmission measurements and found to be in agreement with Mie scattering theory. Furthermore, the dependence of the light outcoupling enhancement on electron transport layer thickness is studied. Depending on the electron transport layer thickness, the NPSL enhances the external quantum efficiency of the investigated white OLEDs by between 1.5 and 2.3-fold. For a device structure that has been optimized prior to application of the NPSL, the maximum external quantum efficiency is improved from 4.7% to 7.4% (1.6-fold improvement). In addition, the scattering layer strongly reduces the undesired shift in emission color with viewing angle.

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