Two series of 2,5-dipyridyl- and 2,5-dithienylphosphole derivatives containing σ3- or σ4-P atoms were prepared, their optical (UV/Vis absorption, fluorescence spectra) electrochemical properties systematically evaluated. These physical depend mainly on the natures 2,5-substituents phosphorus moiety, they revealed that these compounds contain extended π-conjugated systems. Structure–property relationships established basis experimental data ab initio calculations parent molecules. The limited...

Intramolecular excimer emission arising from organic molecules as a blue light source in fluorescent Small Molecule Organic Light Emitting Diodes (SMOLEDs) is almost absent the literature. In this work, three aryl-substituted DiSpiroFluorene–IndenoFluorenes (DSF–IFs 1–3) possessing different properties due to their main emitters have been investigated through structure–property relationship study. Due its particular geometry, rigid DSF–IF platform 2 allows an 'aryl/fluorene/aryl' dimer be...

In the present feature article, we new generations of spirobifluorenes for organic electronics and detail impact positional isomerism on electronic properties device performance.

Abstract Since the beginning of organic light‐emitting diodes (OLEDs), blue emission has attracted most attention and many research groups worldwide have worked on design materials for stable highly efficient OLEDs. However, almost all high‐efficiency OLEDs using fluorescent are multilayer devices, which constituted a stack layers to improve injection, transport, recombination charges within emissive layer. Although technology been mastered, it suffers from real complexity high cost is...

The aim of the present review is to report state art an emerging family molecules, namely 4-substituted spirobifluorenes (<bold>SBF</bold>s).

Abstract The present works report the first structure–property relationship study of a key class organic semiconductors, that is, four spirobifluorene positional isomers possessing para‐ , meta‐ or ortho‐ linkage. remarkable and surprising impact ring bridging linkages on electronic properties regioisomers has been particularly highlighted rationalised. photophysical stressed with notably different influence bridge singlet triplet excited states. member new family spirobifluorenes...

Abstract Thanks to the tremendous effort over last 20 years, phosphorescent organic light‐emitting diodes (PhOLEDs) represent a prevalent technology. In this technology, all high‐efficiency PhOLEDs are multi‐layer devices constituting, in addition emissive layer (EML), of stack functional layers. These layers play crucial role device performance as they improve injection, transport, and recombination charges within EML. Single‐layer (SL‐PhOLEDs) ideal OLEDs, consisting only electrodes...

ConspectusFantastic progresses have been made since the discovery of phosphorescent organic light-emitting diodes (PhOLEDs) in 1998 ( Nature 1998, 395, 151). In emissive layer a PhOLED, heavy-metal complex (emitter) is dispersed as guest an semiconductor (host) order to harvest both singlet and triplet excitons. This host/guest technique essential reach high-performance PhOLEDs. Undoubtedly, designing high-efficiency host materials for red, green, blue phosphors has main driving force field....

Since the first applications of nanohoops in organic electronics appear promising, time has come to go deeper into their rational design order reach high-efficiency materials. To do so, systematic studies dealing with incorporation electron-rich and/or electron-poor functional units on have be performed. Herein, synthesis, electrochemical, photophysical, thermal, and structural properties two [4]cyclo-2,7-carbazoles, [4]C-Py-Cbz, [4]C-Pm-Cbz, possessing electron-withdrawing nitrogen atoms...

A series of new dispiro[fluorene-9',6,9'',12-indeno[1,2b]fluorenes] (DSF-IFs) has been synthesised. These building blocks for blue-light-emitting devices and electroactive polymers combine indenofluorene (IF) spirobifluorene (SBF) properties. We report here our synthetic investigations towards these structures their thermal, structural, photophysical electrochemical properties have compared to those IF SBF. also the anodic oxidation DSF-IFs that leads formation non-soluble transparent...

Taking pole position: The relative position of the ring bridging has a unique and remarkable effect on spectroscopic properties dihydroindeno[1,2-a]/ [2,1-b]fluorenes (see picture). These blue-emitting positional isomers have been successfully used as emitting layer in organic light-emitting diodes (OLEDs), with performance among highest reported for dihydroindenofluorene-based OLEDs.

Through a rational design, novel Donor–Acceptor π-conjugated (D-π-A) blue fluorescent indenofluorene dye, DA-DSF-IF, has been synthesized for application in single-layer Small Molecule Organic Light Emitting Diodes (SMOLEDs). This new emitter possesses bipolar properties as well good morphological and emission color stabilities successfully used emitting SMOLED, with performances impressively magnified compared to nonbipolar emitter.

This work reports the use of 9,9′-spirobifluorene and 4-phenyl-9,9′-spirobifluorene, pure hydrocarbon small molecules, as hosts for efficient green blue phosphorescent OLEDs.

A new high triplet organic semi-conductor based on a donor-spiro-acceptor design has been synthesised and used as host material in performance (EQE = 11.4%) sky blue phosphorescent light emitting diodes.

In this work, we propose pure hydrocarbon materials as universal hosts for high-efficiency red, green and blue phosphorescent organic light-emitting diodes.

Bridged oligophenylenes are very important organic semiconductors (OSCs) in electronics (OE). The fluorene unit, which is a bridged biphenyl, the spearhead of this class materials and has, over last 20 years, led to fantastic breakthroughs light-emitting diodes. Dihydroindenofluorenes belong family terphenyls can be viewed as fusion unit with an indene fragment. have also appeared promising building blocks for OE applications. In dihydroindenofluorene family, there five positional isomers,...

To date, all efficient host materials reported for phosphorescent OLEDs (PhOLEDs) are constructed with heteroatoms, which have a crucial role in the device performance. However, it has been shown recent years that heteroatoms not only increase design complexity but can also be involved instability of PhOLED, is nowadays most important obstacle to overcome. Herein, we pure aromatic hydrocarbon (PHC) as very hosts high-performance white and blue PhOLEDs. With EQE 27.7 %, PHC-based PhOLEDs...

In the field of π-conjugated nanohoops, size macrocycle has a strong impact on its structural characteristics, which in turn affect electronic properties. this work, we report first experimental investigations linking nanohoop to charge transport properties, key property organic electronics. We describe synthesis and study example cyclocarbazole possessing five constituting building units, namely [5]-cyclo-N-butyl-2,7-carbazole, [5]C-Bu-Cbz. By comparison with shorter analogue,...

Through an expedient synthesis, a novel blue emitter, DiSpiroXanthene-IndenoFluorene (DSX-IF) has been designed and synthesized. DSX-IF possesses good morphological color stability upon heating, high quantum yield, may be easily polymerized through anodic oxidation. Small molecule organic light emitting diodes (SMOLEDs), using this promising new dixanthene derivative as emissive layer, exhibit maximum luminance of ca. 3800 Cd.m(-2) with luminous efficiency 1 Cd.A(-1).

We report herein new pyridine-substituted spirobifluorene (SBF) dyes, i.e., 4-(9,9′-spirobi[fluoren]-4-yl)pyridine (4-4Py-SBF), 3-(9,9′-spirobi[fluoren]-4-yl)pyridine (4-3Py-SBF), and 2-(9,9′-spirobi[fluoren]-4-yl)pyridine (4-2Py-SBF), built on the association of 4-substituted spirobifluorenyl core various regioisomers pyridine. These organic semiconductors possess high triplet energy levels (ET around 2.7 eV) in accordance with their use as hosts for green sky-blue phosphorescent...

A new host material based on the 2,7,4′-substituted spirobifluorene platform has been designed and used in single-layer phosphorescent OLED with very high efficiency (EQE = 13.2%) low turn-on voltage (2.4 V). This performance is among best reported for green PhOLEDs may open avenues design of materials devices.

We report herein a detailed structure-properties relationship study of the first examples electron-rich 4-substituted spirobifluorenes for organic electronic applications, namely, 4-phenyl-N-carbazole-spirobifluorene (4-PhCz-SBF) and 4-(3,4,5-trimethoxyphenyl)-spirobifluorene (4-Ph(OMe)3-SBF). The incorporation moieties in ortho position biphenyl linkage (position C4) induces unique properties, very different from those previously described literature this family semiconductors. Both dyes...

Four high triplet organic semi-conductors based on the donor-spiro-acceptor design (D-spiro-A) have been synthesized.