Abstract Organic light-emitting diodes have become a mainstream display technology because of their desirable features. Third-generation electroluminescent devices that emit light through mechanism called thermally activated delayed fluorescence are currently garnering much attention. However, unsatisfactory device stability is still an unresolved issue in this field. Here we demonstrate electron-transporting n-type hosts, which typically include acceptor moiety chemical structure, the...

Abstract Near‐IR organic light‐emitting diodes (NIR‐OLEDs) are potential light‐sources for various sensing applications as OLEDs have unique features such ultra‐flexibility and low‐cost fabrication. However, the low external electroluminescence (EL) quantum efficiency (EQE) of NIR‐OLEDs is a critical obstacle applications. Here, we demonstrate highly efficient NIR emitter with thermally activated delayed fluorescence (TADF) its application to NIR‐OLEDs. The NIR‐TADF emitter, TPA‐PZTCN, has...

This paper proposes a method for measuring distance larger than the wavelength of light with an interferometer using laser diode. uses fact that emitted diode varies in proportion to diode's injection current. The phase difference between two interfering beams due sinusoidal variation wavelength. is detected by optical heterodyne method. magnitude proportional and shift. If shift known, can be obtained from measurement variation. kind multiwavelength interferometry single source. We have...

Harvesting of both triplets and singlets yields electroluminescence quantum efficiencies nearly 100% in organic light-emitting diodes (OLEDs), but the production efficiency excitons that can undergo radiative decay is theoretically limited to electron-hole pairs. Here, breaking this limit by exploiting singlet fission an OLED reported. Based on dependence intensity applied magnetic field, it confirmed produced a rubrene host matrix are emitted as near-infrared (NIR) erbium(III)...

Discussion is made of calculational reconstruction refractive index distribution from "multidirectional interferograms." Two approximate calculation formulae are given for two-dimensional case. One derived using the Born approximation and corresponds to a generalization formula in X-ray structure analysis. The other obtained Rytov's straight path approximation.

The distribution of refractive indices in the crystalline lenses rabbits was measured with a newly developed optical system. assumed to be represented by n=n0-[Z2/A2+(X2+Y2)/B2],where n0 is index at center, Z, X, and Y are coordinates, A B constants. Longitudinal spherical aberrations were calculated ray tracing on models defined above equation, it found that such lens plays very important role decreasing aberration increasing power.

A tenfold improvement in the external electroluminescence quantum efficiency of NIR electrophosphorescence is demonstrated compared to devices with conventional fluorescent materials as host, by applying concept thermally activated delayed fluorescence achieve an emitter layer capable efficient spin conversion. This device architecture can maximize performance organic-semiconductor-based light source.

Abstract The impact of magnetic field effects on the electroluminescence organic light-emitting diodes is commonly used to characterize exciton dynamics such as generation, annihilation, and performance degradation. However, interpreting these challenging. Here, we show that in can be understood terms response device characteristics derived from polaron-pair triplet quenching processes, triplet-polaron interactions triplet-triplet annihilation. Device degradation shows a clear relationship...

Abstract Near‐IR organic light‐emitting diodes (NIR‐OLEDs) are potential light‐sources for various sensing applications as OLEDs have unique features such ultra‐flexibility and low‐cost fabrication. However, the low external electroluminescence (EL) quantum efficiency (EQE) of NIR‐OLEDs is a critical obstacle applications. Here, we demonstrate highly efficient NIR emitter with thermally activated delayed fluorescence (TADF) its application to NIR‐OLEDs. The NIR‐TADF emitter, TPA‐PZTCN, has...

Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Koichi Iwata and Ryo Nagata, "Calculation of Three-Dimensional Refractive-Index Distribution from Interferograms*," J. Opt. Soc. Am. 60, 133-135 (1970) Export BibTex Endnote (RIS) HTML Plain alert Save article

A method for measuring absolute distance by the wavelength shift of laser diode light has previously been proposed. In this work three serious systematic error sources are discussed and some discussion is confirmed experiment. The optical feedback effect, longitudinal mode distribution light, unwanted reflected from devices (coherent noise). effect influences emitted light. causes periodic dependent on measured distance, maximum determined change in intensity ratio submodes to main mode....

Mo/Si multilayer mirrors are used for extreme ultraviolet (EUV) lithography. The formation of hydrogen-induced blisters in the is a problem that reduces reflectance mirror. To evaluate blister-resistance EUV mirrors, blister processes multilayers with capping layer were investigated using high-frequency hydrogen plasma system as ion source under varying exposure conditions. As result, it was observed by low-energy irradiation about 10 eV increases blister-occupied area, depending on amount...

A simple method for measuring the displacement-slope distribution is proposed, and its usefulness verified experimentally. In this we use a single-aperture recording system with only one grating. The grating forms spatial carrier of high frequency inside speckles in image also shears images. sheared images are doubly recorded on photoplate before after deformation object. Clear fringes obtained by filtering plate. This gives us indicating slope distribution. It experimentally that these...

Simultaneous achievement of both high electroluminescence efficiency and operational stability in organic light-emitting diodes (OLEDs) is required for their use various practical applications. Although OLEDs based on thermally activated delayed fluorescence-assisted fluorescence (TAF) are considered to possess a promising device architecture exploit the full potential OLEDs, such systems still requires further improvement. In this study, quaternary emission layer consisting combination TAF...

A scattered-light method using depolarized incident light is used for nondestructive measurement of 3-D stress distribution. In this method, scattered on the plane sheet in interior photoelastic model observed from direction perpendicular to plane. By optical slicing with such a distribution can be determined each slice. Experiments case frozen sphere under diametral compression are made show usefulness proposed method.

Highly conductive poly(3,4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT : PSS) attracts a strong attention as transparent electrode material since it may replace indium tin oxide (ITO) electrodes used in many organic semiconductor devices. However, PEDOT PSS films have been usually deposited using acidic precursors, which caused long term device degradation well safety issues during fabrication processes. This paper firstly reports application of highly on polyethylene...

In this paper, we report on bulk heterojunction organic solar cells fabricated highly conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOTPSS) electrodes directly deposited a flexible polyethylene terephthalate (PET) substrate. The PEDOTPSS layers were using neutralized (pH~7) solution. sheet resistance of the films became more than two orders magnitudes smaller after step treatments that without treatments. include 1) spin coating solution containing 5% dimethyl...

In this paper a method of determining dielectric tensor field in weakly inhomogeneous anisotropic medium with optical activity is presented on the basis an electro-optical theory light propagation such medium. The divided into many identical cubic cells and each cell has some unknown parameters to be determined. Its approximately represented by all cells. evaluation these from data, which are collected recording amplitudes relative phase retardations wave fronts passing through various...

A method for measuring flow velocity distribution in the interior of a transparent fluid is proposed. The utilizes thin sheet laser light, which illuminates containing small scattering particles. double-exposure hologram made with scattered light as signal wave. In reconstructed image we can observe interference fringes correspond to particle displacements between two exposures and consequently velocity. Simple experiments were performed that confirmed usefulness method. discussion relation...