A very high hole mobility of 15 cm2 V-1 s-1 along with negligible hysteresis are demonstrated in transistors an organic-inorganic perovskite semiconductor. This results from the well-developed crystallites, improved conversion to perovskite, reduced trap density, and injection by employing a top-contact/top-gate structure surface treatment MoOx hole-injection layers.

Abstract In this study, we investigate the lasing properties of 4,4′-bis[( N -carbazole)styryl]biphenyl thin films under electrical pumping. The electroluminescent devices incorporate a mixed-order distributed feedback SiO 2 grating into an organic light-emitting diode structure and emit blue lasing. results provide indication by direct injection current film through selection high-gain semiconductor showing clear separation wavelength from significant triplet polaron absorption design...

Abstract Rational manipulation of frontier orbital distribution and singlet‐triplet splitting is crucial to exploit the luminescent properties organic molecules. To realize ultra‐blue luminescence, both blue‐shifted wavelength peak (λ ) narrow full‐width at half‐maximum (FWHM) are required. Herein, a new thermally activated delayed fluorescence (TADF) skeleton by inserting diphenyl methylene intramolecular‐lock adjust torsion angles restrict intramolecular relaxation developed. Two rigid...

Multifunctionalization of carbon nanotubules is easily achieved by attaching functional molecules that provide specific advantages for microscopic applications. We fabricated a double photodynamic therapy (PDT) and photohyperthermia (PHT) cancer phototherapy system uses single laser. Zinc phthalocyanine (ZnPc) was loaded onto single-wall nanohorns with holes opened (SWNHox), the protein bovine serum albumin (BSA) attached to carboxyl groups SWNHox. In this system, ZnPc PDT agent, SWNHox PHT...

The successful covalent functionalization of graphene oxide (GO) with 5-(4-aminophenyl)-10,15,20-triphenyl-21,23H-porphyrin (H2P) has been reported. resulting GO–H2P hybrid material forms stable dispersions in DMF and thoroughly characterized by spectroscopic (UV-vis, ATR-IR, Raman) thermal (TGA) tools. Microscopy techniques (AFM TEM) have employed to probe the morphological characteristics as well investigate exfoliation sheets. Steady-state time-resolved fluorescence emission studies shown...

The occurrence of photoinduced electron transfer in donor−acceptor self-assembled zinc naphthalocyanine (ZnNc) or porphyrin (ZnP) single-wall carbon nanotube (SWNT) nanohybrids has been demonstrated. were constructed by solubilizing nanotubes π−π stacking pyrene functionalized to bear an imidazole moiety, ImPy-SWNT. Through the use ligand soluble ImPy-SWNT, donor ZnNc and ZnP entities axially coordinated yield ZnNc−ImPy-SWNT ZnP−ImPy-SWNT nanohybrids. thus obtained fully characterized using...

The demonstration of continuous-wave lasing from organic semiconductor films is highly desirable for practical applications in the areas spectroscopy, data communication, and sensing, but it still remains a challenging objective. We report low-threshold surface-emitting distributed feedback lasers operating quasi-continuous-wave regime at 80 MHz as well under long-pulse photoexcitation 30 ms. This outstanding performance was achieved using an thin film with high optical gain,...

Single-wall carbon nanotube (SWNT)-based supramolecular nanoarchitectures constructed using photosensitizing donor and acceptor molecules reveal efficient photoinduced charge separation, thus carrying out the role of functional materials desired for light-energy-harvesting photovoltaic cells development novel photocatalysts. Various self-assembly strategies based on SWNT−pyrene π−π interaction are developed in a search double-decker SWNT-based nanohybrids revealing better photochemical,...

Near-infrared (NIR) organic light-emitting devices have aroused increasing interest because of their potential applications such as information-secured displays, photodynamic therapy, and optical telecommunication. While thermally activated delayed fluorescent (TADF) emitters been used in a variety high-performance diodes (OLEDs) emitting the visible spectral range, efficient NIR TADF materials rarely reported. Herein, we designed synthesized novel solution-processable dimeric...

Degradation of organic light-emitting diodes (OLEDs) operated continuously at a constant current density is investigated using photoluminescence techniques. The OLEDs contained the thermally activated delayed fluorescence emitting dopant (4s,6s)-2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN). OLED degradation proceeds mainly on basis excited-state instability host molecules rather than processes related to 4CzIPN. Additionally, electrochemical radical cations and anions influences...

Photoinduced electron transfer in a self-assembled single-wall carbon nanotube (SWNT)-fullerene(C60) hybrid with SWNT acting as an donor and fullerene acceptor has been successfully demonstrated. Toward this, first, SWNTs were noncovalently functionalized using alkyl ammonium pyrene (Pyr-NH3+) to form SWNT/Pyr-NH3+ hybrids. The entity of hybrids was further utilized complex benzo-18-crown-6 fullerene, crown-C60, via ammonium−crown ether interactions yield SWNT/Pyr-NH3+/crown-C60 nanohybrids....

Photoinduced electron transfer in self-assembled single-walled carbon nanotube (SWNT)/zinc porphyrin (ZnP) hybrids utilizing (7,6)- and (6,5)-enriched SWNTs has been investigated. Toward this, first, zinc was covalently functionalized to possess four pyrene entities (ZnP(pyr)(4)). Exfoliation of the semiconducting bundles occurred due pi-pi-type interactions with organic solvents. The nanohybrids thus formed were isolated characterized by TEM, UV-visible-near-IR, Raman spectroscopy....

The optical, structural, and electroluminescent (EL) characteristics of pure quasi-2D CsPb2Br5 were reported. We fabricated continuous, compact, well-crystallized films by centrifugal coating from a colloidal solution containing nanoparticles. centrifugal-coated have photoluminescence quantum yield (PLQY) ∼35% because its low-dimensional structure. Taking advantage the high PLQY, we perovskite light-emitting diodes (PeLEDs) with emitting layer exhibiting bright green EL, maximum luminance...

Large electron injection barriers and electrode degradation are serious issues that need to be overcome obtain n-channel operation in field-effect transistors with an organic-inorganic layered perovskite (C6H5C2H4NH3)2SnI4 semiconductor. By employing low-work-function Al source/drain electrodes by inserting C60 layers between the semiconductor reduce barrier suppress degradation, we demonstrate mobilities of up 2.1 cm2/V s, highest value ever reported spin-coated transistors. The transport...

Abstract Advanced organic laser dyes exhibiting high solubility and bipolar behavior are developed based on a structure combining bis‐stilbene with carbazole (BSBCz). The materials show photoluminescence quantum yields large radiative rate constants in solutions, crystals, blend neat films. introduction of alkyl groups significantly improves the BSBCz, solution‐processed films alkyl‐substituted derivatives exhibit amplified spontaneous emission thresholds as low 0.59 µJ cm −2 , which is...

Open AccessCCS ChemistryMINI REVIEW1 Aug 2020The Leap from Organic Light-Emitting Diodes to Semiconductor Laser Chihaya Adachi and Atula S. D. Sandanayaka *Corresponding authors: E-mail Address: [email protected] Center for Photonics Electronics Research, Kyushu University, Fukuoka 819-0395 Google Scholar More articles by this author Department of Physical Sciences Technologies, Faculty Applied Sciences, Sabaragamuwa University Sri Lanka, Belihuloya 70140...

Abstract Large external quantum efficiency rolloff at high current densities in organic light-emitting diodes (OLEDs) is frequently caused by the quenching of radiative singlet excitons long-lived triplet [singlet–triplet annihilation (STA)]. In this study, we adopted a scavenging strategy to overcome aforementioned STA issue. To construct model system for scavenging, selected 2,6-dicyano-1,1-diphenyl-λ 5 σ 4 -phosphinine (DCNP) as emitter and 4,4′-bis[( N -carbazole)styryl]biphenyl (BSBCz)...

This work investigates the feasibility of using low-dimensional perovskites for electrically driven lasers given current status perovskite light-emitting diodes and optically pumped lasers. In our progress toward lasers, we performed a variety measurements on bulk films to give baseline expectations. included measurement amplified spontaneous emission, lasing, near-infrared operated at low high density. We considered power density thresholds needed emission lasing compared this speculate...

Abstract The covalent attachment of carbon nanohorns (CNHs) to α‐5‐(2‐aminophenyl)‐α‐15‐(2‐nitrophenyl)‐10,20‐bis(2,4,6‐trimethyl‐phenyl)‐porphyrin (H 2 P) via an amide bond is accomplished. resulting CNH–H P nanohybrids form a stable inklike solution. High‐resolution transmission electron microscopy (HRTEM) images demonstrate that the original dahlia‐flowerlike superstructure CNHs preserved in nanohybrids. Steady‐state and time‐resolved fluorescence studies show efficient quenching excited...

A highly stable porphyrin–fullerene conjugate with defined distance and orientation, was formed using a newly developed 'two-point' binding strategy involving axial-coordination cation–crown ether complexation; photochemical studies performed in benzonitrile revealed efficient charge separation slow charge-recombination the supramolecular complex.

We have successfully constructed fullerene-encapsulated porphyrin hexagonal nanorods in DMF-acetonitrile solution mixed with CTAB surfactant, which demonstrate efficient and characteristic photoinduced electron transfer light energy conversion properties.

A system that models a photosynthetic composite of the light-harvesting complex and reaction center is reported in which light energy collected by cyclic antenna porphyrins transferred to central energy-acceptor porphyrin, followed photoinduced electron transfer fullerene positioned above ring plane. Pyridyl tripodal ligands appended with bis(phenylethynyl)porphyrinatozinc(II) (ZnP-Tripod) additional fulleropyrrolidine moieties (C(60)-ZnP-Tripod) were synthesized as units. The ligand was...