To achieve high-efficiency deep-blue electroluminescence satisfying Rec.2020 standard blue gamut, two thermally activated delayed fluorescent (TADF) emitters are developed: 5-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-10,10-diphenyl-5,10-dihydrodibenzo[b,e][1,4]azasiline (TDBA-PAS) and 10-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-9,9-diphenyl-9,10-dihydroacridine (TDBA-DPAC). Inheriting from their parented organoboron multi-resonance...

In this work, four phenanthroimidazole (PI) based isomers <bold>TPA-PPI-PBI</bold>, <bold>TPA-PPI-NPBI</bold>, <bold>PBI-PPI-TPA</bold> and <bold>NPBI-PPI-TPA</bold> for high-efficiency deep-blue organic light-emitting diodes (OLEDs) have been designed synthesized.

Abstract High‐performance deep‐blue emitters with external quantum efficiencies (EQEs) exceeding 5 % are still scarce in organic light‐emitting diodes (OLEDs). In this work, by introducing a [1,2,4]triazolo[1,5‐ ] pyridine (TP) unit at the N1 position of phenanthroimidazole (PI), two luminescent materials, PTPTPA and , were obtained. Systematic photophysical analysis showed that TP block is suitable for constructing hybridized local charge‐transfer (HLCT) emitters. Its moderate...

A phenanthroxazole-based fluorescent sensor for Cd2+ has been developed. Of particular significance is the specific ratiometric response of toward without interference from other biologically important metal ions including Zn2+. The test paper made this exhibits both absorption and color changes when exposed to aqueous solution.

A photoredox/cobaloxime co-catalyzed coupling reaction of α-ketoacids and methacrylates to obtain allylic ketones is described. Without the cobaloxime catalyst, 1,4-dicarbonyl compounds are generated. The catalyst enables dehydrogenation generate formation new olefins. generality, good substrate scope mild conditions features in catalysis protocol, this method will provide opportunities for functionalization more

Two novel bipolar deep-blue fluorescent emitters, IP-PPI and IP-DPPI, featuring different lengths of the phenyl bridge, were designed synthesized, in which imidazo[1,2-a]pyridine (IP) phenanthroimidazole (PI) proposed as an electron acceptor donor, respectively. Both them exhibit outstanding thermal stability high emission quantum yields. All devices based on these two materials showed negligible efficiency roll-off with increasing current density. Impressively, non-doped organic...

Comprehensive Summary The EDA complex‐mediated reactions involving oxime esters have been few studied. Herein, an complex formed by thiophenolate anion and ester is reported for photoinduced divergent synthesis of thioethers, depending on different types esters. Operational simplicity, mild reaction conditions, flexible options leaving group demonstrate the generality synthetic utility this approach. Such approach can also enable interesting thiol‐catalysis phenanthridines.

Two multifunctional emitters based on asymmetric molecular design overcome the ACQ. The devices showed impressive performance and mechanochromic properties.

Since the water oxidation half-reaction requires transfer of multi-electrons and formation O-O bond, it's crucial to investigate catalytic behaviours semiconductor photoanodes. In this work, a bio-inspired copper-bipyridine catalyst Cu(dcbpy) is decorated on nanoporous Si photoanode (black Si, b-Si). Under AM1.5G illumination, b-Si/Cu(dcbpy) exhibits high photocurrent density 6.31 mA cm-2 at 1.5 VRHE pH 11.0, which dramatically improved from b-Si (1.03 ) f-Si (0.0087 ). Mechanism studies...

Highly efficient fluorescence/phosphorescence hybrid WOLEDs have been realized by employing a new blue fluorescent material.

Abstract Acquiring desirable device performance with deep‐blue color purity that fulfills practical application requirements is still a challenge. Bipolar fluorescent emitters hybrid local and charge transfer (HLCT) state may serve to address this issue. Herein, by inserting anthracene core in the building blocks, authors successfully developed two highly twisted D‐π‐A emitters, ICz‐An‐PPI IP‐An‐PPI , featuring different acceptor groups. Both exhibited superb thermal stabilities, high photo...

We studied the performance of exciplex-based organic light-emitting devices (OLEDs) made different electron transporting materials (ETMs) with similar affinities to minimize effect lowest unoccupied molecular orbital levels. A strong correlation was observed between intensity exciplex emission and choice ETMs. The relied on interfacial charge accumulation densities at organic/organic contacts, which in turn determined device color efficiency. Contrary common belief, highly efficient OLEDs...

A novel luminescent Zn2+ ions chemosensor, a cyclometalated platinum(II) bipyridyl acetylide complex, was designed. Of particular significance is that it shows high sensitivity towards without interference from other biologically important cations in acetonitrile. The tautomerization of amide favors detecting among HTM (heavy and transition metal) aqueous systems.

Abstract Efficient multifunctional materials acting as violet‐blue emitters, well host for phosphorescent OLEDs, are crucial but rare due to demand that they should have high first singlet state (S 1 ) energy and triplet (T simultaneously. In this study, two new bipolar fluorophores, TPA‐PI‐SBF SBF‐PI‐SBF , were designed synthesized by introducing the hole transporting moiety triphenylamine (TPA) spirobifluorene (SBF) unit has T into deep blue emission quantum yield group phenanthroimidazole...

Abstract A new triphenylamine‐bridged fluoranthene derivative, 4‐(7,10‐diphenylfluoranthen‐8‐yl)‐ N ‐[4‐(7,10‐diphenylfluoranthen‐8‐yl)phenyl]‐ ‐phenylaniline (BDPFPA), with a high glass transition temperature of 220 °C has been synthesized and characterized. BDPFPA is highly fluorescent versatile material that can be used as nondoped green emitter hole transporter. was in standard trilayer device the emitting layer, which showed low turn‐on voltage (&lt;3 V) efficiency 11.6 cd −1 . The also...

We synthesized eight phenanthroimidazole derivatives as blue emitters for OLED application and investigated the relationship between molecule structure optoelectronic properties.

A new ternary acceptor (A)-donor (D)-acceptor (A) asymmetrically twisted deep-blue emitting molecule, PPI-2BI, was synthesized by attaching two electrophilic benzimidazole (BI) units to the C2 and N1 positions of a phenanthroimidazole (PI) donor unit. Profiting from enhanced D-A electronic coupling, electron injecting transporting abilities triangle-shaped A-D-A molecule are considerably improved shows high photoluminescence (PL) electroluminescence (EL) efficiencies. By using PPI-2BI as...

Abstract To build up efficient host materials, two novel organic small molecules ICz‐PPI and 2ICz‐PPI were designed synthesized, in which phenanthro[9,10‐d]imidazole (PI) is proposed as a potential luminophore with high stability, while the indolo[3,2,1‐ jk ]carbazole (ICz) has triplet energy excellent thermal stability. Both exhibited weak intramolecular charge transfer, decomposition temperature ( T d ) quantum yield. can act emitting layer non‐doped light‐emitting diodes (OLEDs), achieved...

Of paramount significance in phosphorescent organic light‐emitting diodes (PHOLEDs) are the facts that Förster resonance energy transfer (FRET) must be sufficient and back should prohibited. Herein, FRET efficiencies for high‐performance PHOLEDs based on a simple bipolar luminogen 1‐phenyl‐2‐(5′‐phenyl‐[1,1′:3′,1″‐terphenyl]‐4‐yl)‐1 H ‐phenanthro[9,10‐ d ]imidazole ( PHT‐PPI ) with high triplet of 2.44 eV systematically investigated. As result, PO‐01 as dopant, orange PHOLED is achieved...