An extremely high-efficiency solution-processed white organic light-emitting diode (WOLED) is successfully developed by simultaneously using an ideal dendritic host material and a novel efficient orange phosphorescent iridium complex. The optimized device exhibits forward-viewing efficiencies of 70.6 cd A−1, 26.0%, 47.6 lm W−1 at luminance 100 m−2, respectively, promising the low-cost WOLEDs bright future as next generation illumination sources. Detailed facts importance to specialist...

As good as red: Highly efficient pure red OLEDs based on iridium electrophosphors functionalized with hole-transporting triphenylamine dendrons are prepared (see picture). These bifunctional dendrimers give a peak efficiency of 11.7 % an excellent color quality and offer attractive avenue for the development metal phosphors optimized efficiency/color purity trade-offs required red-emitting devices. OLED=organic light-emitting diode. Supporting information this article is available WWW under...

The authors report enhanced poly(3-hexylthiophene) (P3HT):methanofullerene (PCBM) bulk-heterojunction photovoltaic cells via 1,2-dichlorobenzene (DCB) vapor treatment and thermal annealing. DCB can induce P3HT self-organizing into ordered structure leading to absorption high hole mobility. Further annealing the device at a temperature, PCBM molecules begin diffuse aggregates together with phase form bicontinuous pathways in entire layer for efficient charge separation transport. Compared...

Abstract A double B←N bridged bipyridyl (BNBP) is a novel electron‐deficient building block for polymer electron acceptors in all‐polymer solar cells. The bridging units endow BNBP with fixed planar configuration and low‐lying LUMO/HOMO energy levels. As result, the based on (P‐BNBP‐T) exhibits high mobility, levels, strong absorbance visible region, which desirable acceptors. Preliminary cell (all‐PSC) devices P‐BNBP‐T as acceptor PTB7 donor exhibit power conversion efficiency (PCE) of 3.38...

Abstract We demonstrate that polymer electron acceptors with excellent all‐polymer solar‐cell (all‐PSC) device performance can be developed from donors by using B←N units. By alleviating the steric hindrance effect of bulky pendant moieties on conjugated polymers contain units, π–π stacking distance backbones is decreased and mobility consequently enhanced nearly two orders magnitude. As a result, power conversion efficiency all‐PSCs acting as acceptor greatly improved 0.12 % to 5.04 %. This...

Abstract The key parameters of conjugated polymers are lowest unoccupied molecular orbital (LUMO) and highest occupied (HOMO) energy levels. Few approaches can simultaneously lower LUMO HOMO levels to a large extent (>0.5 eV). Disclosed herein is novel strategy decrease both by about 0.6 eV through replacement CC unit B←N unit. makes the resulting polymer transform from an electron donor into acceptor, proven fluorescence quenching experiments photovoltaic response. This work not only...

Three highly rigid and planar low-bandgap conjugated polymers comprising alternate isoindigo dithienocarbazole groups are synthesized for the fabrication of high performance polymer solar cells. Power conversion efficiencies up to 7.2% conventional devices 8.2% inverted demonstrated.

Abstract A series of orange‐red to red phosphorescent heteroleptic Cu I complexes (the first ligand: 2,2′‐biquinoline (bq), 4,4′‐diphenyl‐2,2′‐biquinoline (dpbq) or 3,3′‐methylen‐4,4′‐diphenyl‐2,2′‐biquinoline (mdpbq); the second triphenylphosphine bis[2‐(diphenylphosphino)phenyl]ether (DPEphos)) have been synthesized and fully characterized. With highly rigid bulky biquinoline‐type ligands, [Cu(mdpbq)(PPh 3 ) 2 ](BF 4 [Cu(mdpbq)(DPEphos)](BF emit efficiently in 20 wt % PMMA films with...

Three low bandgap conjugated polymers, i.e., PDTPBT-C8, PDTPBT-C6 and PDTPBT-C5, which consist of alternating N-alkyl dithieno[3,2-b:2′,3′-d]pyrrole 2,1,3-benzothiadiazole units carry 1-octylnonyl, 1-hexylheptyl 1-pentylhexyl as side chains, respectively, were synthesized. These polymers show strong absorption in the wavelength range 600–900 nm with enhanced coefficient length alkyl chain decreases. The film morphology 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-C-61 (PCBM) blends is also...

A series of donor-acceptor (D-A) co-oligomers with oligo(fluorene-alt-bithiophene) and perylene diimide as donor acceptor segments, respectively, have been designed synthesized. They can self-assembly into alternating D-A lamellar nanostructured films the periods depending on molecular length. These successfully used in fabrication high-performance single-molecular solar cells power conversion efficiency up to 1.50%.

We synthesize and systematically study a series of conjugated polymers with oligo(ethylene glycol) (OEG) or alkyl chain as the side poly[2,7-fluorene-alt-5,5-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)] polymer backbone. Replacing OEG can decrease π–π stacking distance backbone in thin film from 0.44 to 0.41 nm because is more flexible than chain. As result, exhibits higher hole mobility, red-shifted absorption spectrum smaller bandgap those With increase length chain, resulting exhibit...

New donor/acceptor polymers PBDTDPT1 and PBDTDPT2 with alternating benzodithiophene N-alkylated dioxopyrrolo-thiophene were synthesized. The new had deep HOMO levels of -5.42 -5.44 eV for PBDTDPT2, respectively. A based BHJ solar cell device achieved a PCE 4.79% V(oc) 0.91 V.

High-efficiency inverted polymer solar cells based on PCDTBT:PC70BM blend with the MoO3-Al composite film as cathode buffer layer and MoO3/Al anode have been demonstrated. A VOC of 0.88 V, a JSC 10.88 mA cm−2, FF 70.7% PCE 6.77% are achieved. The films highly transparent adjustable work functions which can be fine tuned Al content in composite, thus allowing us to optimize interfacial property at layer/BHJ interfaces reduce recombination loss improve photovoltaic performance. This new...

A series of new isoindigo-based low banbap polymers, containing thiophene, thieno[3,2-b]thiophene and benzo[1,2-b:4,5-b′]dithiophene as donors, have been synthesized by Stille cross-coupling reaction. Their photophysical, electrochemical photovoltaic properties investigated. These polymers exhibit broad strong absorption between 400 800 nm with maxima around 700 nm. The HOMO energy levels vary −5.20 −5.49 eV the LUMO range from −3.66 to −3.91 eV. optical bandgaps are optimized for solar cell...

Abstract A series of novel red‐emitting iridium dendrimers functionalized with oligocarbazole host dendrons up to the third generation ( red‐G3 ) have been synthesized by a convergent method, and their photophysical, electrochemical, electroluminescent properties investigated. In addition controlling intermolecular interactions, oligocarbazole‐based could also participate in electrochemical charge‐transporting process. As result, highly efficient electrophosphorescent devices can be...

A novel class of hosts suitable for solution processing has been developed based on a conjugated dendritic scaffold. By increasing the dendron generation, highest occupied molecular orbital (HOMO) energy level can be tuned to facilitate hole injection, while triplet remains at high level, sufficient host high-energy-triplet emitters. power-efficient blue-electrophosphorescent device H2 is presented.

To realize power efficient solution-processed phosphorescent organic light-emitting diodes (s-PhOLEDs), the corresponding high driving voltage issue should be well solved. solve it, efforts have been devoted to exploitation of novel host or interfacial materials. However, issues charge trapping phosphor and/or injection barrier are still serious, largely restraining efficiency (PE) levels. Herein, with utilization an exciplex-forming couple 4, 4',...

Better without doping: Use of a dendron with high carbazole density around an iridium core has been found to improve the performance nondoped electrophosphorescent devices more effectively than use higher-generation dendrimers. A promising efficiency as 45.7 cd A−1 (13.4 %) together luminance is obtained for 6 B-G1 (see picture). These values are very close those corresponding doped device. Detailed facts importance specialist readers published "Supporting Information". Such documents...

Abstract A solution‐processed neutral hole transport layer is developed by in situ formation of MoO 3 aqueous PEDOT:PSS dispersion (MoO ‐PEDOT:PSS). This ‐PEDOT:PSS composite film takes advantage both the highly conductive and ambient conditions stability ; consequently it possesses a smooth surface considerably reduced hygroscopicity. The resulting bulk heterojunction polymer solar cells (BHJ PSC) based on poly[2,3‐bis‐(3‐octyloxyphenyl)quinoxaline‐5,8‐diyl‐alt‐thiophene‐2,5‐diyl]...

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Electroluminescence of a Conjugated Polymer with Thermally Activated Delayed FluorescenceYunhui Zhu†‡, Yuewei Zhang#, Bing Yao†‡, Yanjie Wang†‡, Zilong Zhang†, Hongmei Zhan†, Baohua Zhang*†, Zhiyuan Xie†, Yue Wang*#, Yanxiang Cheng*†View Author Information† State Key Laboratory Physics Chemistry, Changchun Institute Applied Chinese Academy Sciences, 130022, P. R. China‡ University Beijing 100039, P.R. China# Lab Supramolecular Structure...

Abstract The morphology with the interpenetrating network and optimized vertical phase separation plays a key role in determining charge transport collection polymer:nonfullerene small molecular acceptors (SMAs) solar cells. However, crystallization of polymer SMAs usually occurs simultaneously during film‐forming, thus interfering process each other, leading to amorphous film undesirable lateral separation. poly(3‐hexylthiophene) (P3HT):O‐IDTBR blend is selected as model system, controlling...

A novel red heteroleptic iridium complex, Ir(DPA-Flpy-CF₃)₂acac, was synthesized and whose corresponding solution-processed PhOLED shows a record power efficiency of 44.5 lm W⁻¹ with CIE coordinates (0.64, 0.36).