Solution‐processed high‐performance orange phosphorescent and white PLEDs with a high color‐rendering index from an unprecedented π‐stacked and π‐conjugated host material

Abstract

A blue fluorescent polymer based on poly(vinyl carbazole) (PVK) and terfluorene, combined to make a chemical hybrid at the carbazole unit (PVK-TF), is fully characterized in this study. PVK-TF shows useful emission features, such as peaks at 400, 420, 437, 460, and 496 nm, depending on the processing conditions. It possesses a relatively high triplet energy level (2.23 eV), electrochemical stability, good filmforming ability, and morphological stability. Based on this blue fluorescent material, highly efficient orange phosphorescent polymer light-emitting diodes (PLEDs) were fabricated with a maximum efficiency of 21.99 cd A KEYWORDS: high color rendering index; high performance polymers; light-emitting diodes; morphology; solution process INTRODUCTION In the past two decades, organic light-emitting diodes (OLEDs) have been used to develop high-performance devices, including commercial model OLED displays, because of advantages such as being super-thin, high-contrast, power-saving, flexible, having a fast response, and having a low temperature resistance. The low temperature resistance is uniquely important for application in extreme environments, which is not displaceable for conventional LCD displays. This has been recognized as a promising alternative display and solid-state lighting technology.

Low‐Cost Nucleophilic Organic Bases as n‐Dopants for Organic Field‐Effect Transistors and Thermoelectric Devices

“…Organic semiconductors (OSCs) have become the material of choice for a wide range of emerging optoelectronic applications, including organic light-emitting diodes (OLEDs), [1][2][3] organic field-effect transistors (OFETs), [4][5][6][7] and organic photovoltaics (OPVs). [8,9] However, the relatively poor performance of organic devices in comparison with conventional semiconductor devices is a bottleneck impeding their commercial applications.…”