The fabrication of color-tunable organic light-emitting diode displays via solution processing

Abstract

Electroluminescent devices based on organic semiconductors have attracted significant attention owing to their promising applications in flat-panel displays. The conventional display pixel consisting of side-by-side arrayed red, green and blue subpixels represents the mature technology but bears an intrinsic deficiency of a low pixel density. Constructing an individual color-tunable pixel that comprises vertically stacked subpixels is considered an advanced technology. Although color-tunable organic light-emitting diodes (OLEDs) have been fabricated using the vacuum deposition of small molecules, the solution processing of conjugated polymers would enable a much simpler and inexpensive manufacturing process. Here we present the all-solution processing of color-tunable OLEDs comprising two vertically stacked polymer emitters. A thin layer of highly conducting and transparent silver nanowires is introduced as the intermediate charge injection contact, which allows the emission spectrum and intensity of the tandem devices to be seamlessly manipulated. To demonstrate a viable application of this technology, a 4-by-4 pixelated matrix color-tunable display was fabricated.

Visible light communication with efficient far-red/near-infrared polymer light-emitting diodes

“…The interest in OLEDs for communication is driven not only by their widespread use in display technologies but also by the very same advantages that have been driving the success of organic electronics. Above all, organic semiconductors (OSs) can be cheaply deposited over large areas, either via thermal evaporation or from solution via spin 15 , blade 16 , inkjet 17 , or spray coating 18 . Large area OS-based luminaires are already entering the market 19 and are expected to be the next mass application of OSs after active-matrix OLED (AMOLED) displays.…”

Design Strategy for Solution‐Processable Thermally Activated Delayed Fluorescence Emitters and Their Applications in Organic Light‐Emitting Diodes

“…In addition to molecular engineering of TADF emitters, a device fabrication technique is another important factor in determining device performance and total cost of OLEDs. A solution process such as spin coating, blade coating, and inkjet printing holds great promise in mass production of OLEDs for its simple, low‐cost, and easily scalable advantages . However, the current state‐of‐the‐art OLEDs are mainly based on the well‐established vacuum deposition techniques with the multilayer structures.…”

Exploring copper as a catalyst for cost effective synthesis of polyfluorenes: an alternative to platinum and palladium

“…This could facilitate bulk production of the light emitting polymers (LEPs) by reducing the overall cost involved with the use of expensive palladium for polymerisation. Owing to their application in solid-state lighting and flat-panel displays [19][20][21] LEPs have generated great interest in the field of organic light emitting diodes (OLEDs), organic solar cells, organic field effect transistors (OFETs) and biological as well as chemical sensors [22][23][24][25][26][27]. Polyfluorene (PF) is a blue light emitter which is the most extensively studied class of conjugated polymer because of its high photoluminescent (PL) efficiency, good thermal stability and Electronic supplementary material The online version of this article (https ://doi.org/10.1007/s4245 2-020-2344-9) contains supplementary material, which is available to authorized users.…”