White Organic Light‐Emitting Diodes Based on Quench‐Resistant Fluorescent Organophosphorus Dopants

Abstract

The control of the doping ratio of a blue‐emitting matrix by an orange emitter with high accuracy still remains very challenging in the development of reproducible white organic light‐emitting diodes (WOLEDs). In this work, the development of an organophosphorus dopant that presents a high doping rate in order to reach white emission is reported. The increase of the doping rate has a small impact on the CIE co‐ordinates and on the EQE. These results are very appealing towards the development of “easy‐to‐make” WOLEDS.

Near‐Infrared Phosphorus‐Substituted Rhodamine with Emission Wavelength above 700 nm for Bioimaging

“…The electron‐accepting properties of the phosphorus moiety can be further increased by phosphine oxides (P‐oxides), which tune the chemical and photophysical properties. Because of these attractive features of the phosphorus moiety, phosphacyclic π‐conjugated materials have been widely applied in organic light‐emitting diodes,14 organic photovoltaic cells,15 and fluorescent probes 16…”

“…The electron-accepting properties of the phosphorus moiety can be further increased by phosphine oxides( P-oxides), which tunet he chemical and photophysical properties. Because of these attractive features of the phosphorus moiety,p hosphacyclic p-conjugated materials have been widelya ppliedi no rganic light-emitting diodes, [14] organic photovoltaic cells, [15] and fluorescent probes. [16] Inspired by the unique geometrical and electronic characteristics of phosphorus, we successfully fused ap hosphorus atom into the rhodamine framework to replace the bridging oxygen atom and obtained as eries of phosphorus-substituted rhodamines (PR, Scheme 1) with fluorescencee missione xtended into the region above 700 nm.…”

Organophosphorus Compounds in Organic Electronics

“…The fabricated devices show almost white‐light emission properties. The optimal conditions for “white light” (CIE values of 0.29, 0.35) were achieved at a 3.2 % doping rate of the phosphole oxide 28 a (Figure ), which gave a brightness of 898 cd m −2 at 20 mA cm −2 . Other attempts to adjust and optimize the luminescent properties of phosphole building blocks included their incorporation into larger annulated systems.…”

“…[65] In search of other phosphole-basedm aterials that could be used to fabricate (white) OLED devices, ah ybrid thiophene- Figure 6), whichgave abrightness of 898 cd m À2 at 20 mA cm À2 . [66] Other attempts to adjust and optimize the luminescent properties of phosphole building blocks included their incorporation into larger annulated systems. Noteworthy,b enzofurane phospholes 29 ( Figure 6) were employed as blue-green emitters in aD PYBi (4,4'-bis (2,2'-diphenylvinyl) biphenyl) matrix achieving good externalq uantum efficiencies (EQE).…”

Transparent electrode of nanoscale metal film for optoelectronic devices

“…[1][2][3][4][5][6][7][8][9] Indium tin oxide (ITO) is widely used as a TCO due to its high optical transmittance (OT ∼90%) and good conductivity (sheet resistance R s < 20 Ω∕□). [10][11][12] However, ITO film has limitations due to its high growth temperature, high cost, and poor mechanical flexibility. 13,14 Furthermore, ITO films are obtained using sputtering techniques, which can damage the underlying layers.…”