Organic light-emitting devices with saturated red emission using 6,13-diphenylpentacene

Abstract

Organic electroluminescent devices with saturated red emission were developed using 6,13-diphenylpentacene (DPP) doped into tris(8-hydroxyquinolinato) aluminum III (Alq3). DPP exhibits a narrow emission spectrum giving rise to a saturated red peak, centered around 625 nm, with excellent chromaticity coordinates (x=0.63 and y=0.34) in accordance with the Commission Internationale de l’Eclairage. An absolute photoluminescence (PL) quantum yield (φPL) of ∼30% was measured for a composite film of 0.55 mol % of DPP doped into Alq3. An electroluminescence (EL) quantum efficiency of 1.3% at 100 A/m2, close to the estimated theoretical limit (1.5%), was measured for an unoptimized device structure that consists of an active emissive layer sandwiched between hole- and electron-transport layers. In addition, the EL quantum efficiency is constant or stable over a wide range of current densities (1–1000 A/m2) or luminance values (1–1000 cd/m2).

Nature of ground and electronic excited states of higher acenes

“…The larger tetracene (4) and pentacene (5) are promising organic semiconductors and have been applied as OFETs (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17) thanks to a low vibrational reorganization energy and therefore a high hole mobility (18). Many of the derivatives of 4 and 5 are good candidates for OLEDs (19)(20)(21)(22). Recently, with a growing interest in solar energy and solar cells, 4 and 5 have also been made into OPV devices (23)(24)(25)(26)(27).…”

Structure Effects on Organic Thin-Film Transistor Properties of Dinaphthyl Substituted Pentacene Derivatives

“…[10][11][12] The resulting products are soluble in common organic solvents, such as chloroform, THF and toluene. The structure was identified by 500 MHz NMR, UV-Visible spectroscopy and FAB-Mass analysis.…”

Simple and Efficient Near‐Infrared Organic Chromophores for Light‐Emitting Diodes with Single Electroluminescent Emission above 1000 nm

“…Such a phenomenon is quite common in red-emitting OLEDs, due to the emissive quenching by charged or triplet species that are electrogenerated in the device. [17][18][19] The red-or NIR-emissive materials usually have a smaller band gap and are more susceptible to attacks by charges than other materials. In comparison, the devices based on chromophores 1 and 3 emitted at the same wavelength of 1050 nm, and had the EQE of 0.08 and 0.12% at a current density of 10 mA cm À2 , which are still higher than those of most reported organic NIR complexes and dyes.…”