Efficient Blue‐Light‐Emitting Polymer Heterostructure Devices: The Fabrication of Multilayer Structures from Orthogonal Solvents

Abstract

An all‐solution processed organic light‐emitting diode with enhanced device efficiency based on an additional methanol‐soluble polyfluorene layer (see figure) with nonionic ethylene glycol side chains is presented. Due to an asymmetric shift of the energy levels at the polymer/polymer interface, significant efficiency enhancements were obtained.

High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes

“…Despite thirteen years of extensive research attention, phosphorescent organic/polymer light-emitting diodes (OLEDs/ PLEDs) still generate considerable interest as potential candidates for use in flat panel displays and solid-state lighting [1][2][3][4][5]. Either a small organic molecular material or a polymer can be adopted as a phosphorescent dye host [6].…”

Formation of blade and slot die coated small molecule multilayers for OLED applications studied theoretically and by XPS depth profiling

“…1,2 Evaporation techniques 3 and solution processing 4 can be applied for the manufacturing of multilayer OLED devices. Solution processing offers the possibility of reducing the production time and costs [5][6][7] and is a standardized process in several industrial applications.…”

“…13 One of the most promising approaches is the orthogonal solvent one 14 investigated for laboratory method spin coating. 4,[15][16][17] According to this approach, the second layer is applied while using a solvent in which the material of the first layer is insoluble. The confinements are that the solubilities of the semiconductor materials cannot be varied in a wide range without changing the electric properties and that most solvents show a low solubility.…”

Solution-processed organic devices developed by a novel cost-effective patterning technique based on electrical erosion

“…Some of the key challenges going forward still reside with materials or device development, but manufacturing equipment or processes are receiving major attention. Initiatives in this line focus on solution-processing [1,2], large area deposition techniques and the use of flexible substrates.…”