Nondoped OLEDs utilizing a new emitter exhibited EL with NTSC CIE_y and high EQE_max (5.80%) low efficiency roll-off.

n-ZnO/p-GaN heterojunction light emitting diodes with different interfacial layers were fabricated by pulsed laser deposition. The electroluminescence (EL) spectra of the display a broad blue-violet emission centered at 430 nm, whereas n-ZnO/ZnS/p-GaN and n-ZnO/AlN/p-GaN devices exhibit ultraviolet (UV) emission. Compared AlN interlayer, which is blocking both electron hole hetero-interface, utilization ZnS as intermediate layer can lower barrier height for holes keep an effective electron....

Abstract n-ZnO : Ga/p-GaN heterojunction light-emitting diodes with different interfacial layers are fabricated by pulsed laser deposition. All the devices demonstrate nonlinear rectifying behaviour. Due to formation of Ga 2 O 3 layers, exhibits strong ultraviolet emission centred at 382 nm and blue 423 nm. Compared a Ga/MgO/p-GaN diode, turn-on voltage layer drops down 7.6 V intensity is enhanced. Detailed electroluminescence mechanisms influenced discussed using band diagram heterojunctions.

Properties of electromagnetic waves with normal and oblique incidence have been studied for one-dimensional plasma layers sinusoidal densities. Wave transmittance as a function wave frequency exhibits photonic band gaps characteristic crystals. For periodic structures, increasing collision is demonstrated to lead greater absorption, the modulation factor enlarges gap width, angle can change locations two polarizations. If defect layer introduced by inserting new in center, mode may appear...

The light-emitting diodes (LEDs) with single, twin, triple, and quadruple photonic crystals (PCs) on p-GaN are fabricated by multiple-exposure nanosphere-lens lithography (MENLL) process utilizing the focusing behavior of polystyrene spheres. Such a technique is easy economical for use in fabricating compound nano-patterns. optimized tilted angle decided to be 26.6° through mathematic calculation try avoid overlay patterns. results scanning electron microscopy simulations reveal that pattern...

We propose a compact fluorescence sensing scheme based on hollow core Bragg fibers (HCBFs) that simultaneously serve as sample cell, collector, and delivery channel for the desired fluorescence, well filter residual excitation light mixed with fluorescence. The liquid samples filled in air are laterally irradiated by spatial separation from Both photonic bandgap (PBG) effect common HCBF (C-HCBF) transverse resonant behavior defect (D-HCBF) can be employed filtering performance of strongly...

Surface-enhanced Raman scattering (SERS) fiber probes are useful for remote and online detection of harmful molecules using the SERS effect. In this study, a 3-dimensional (3D) optical probe is proposed. The formation 3D mainly included three steps: construction monolayer polystyrene (PS) spheres as mask on end face fiber, reactive ion etching (RIE) PS fibers, metal sputtering deposition. Compared with flat surface probes, these composed ordered nanocolumn arrays, which have advantages...

We propose a hollow core Bragg fiber (HC-BF) with heterostructured cladding based on the ternary 1-D photonic crystal (T-1DPC) in this paper. The distinguishing unit cell of T-1DPC is formed from polyetherimide (PEI) layer sandwiched by two As <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> layers same thickness. demonstrate its capability for mid-infrared broadband and low-loss...

We propose a high-linearity refractive index (RI) sensor based on an analyte-filled defect hollow core Bragg fiber (DHCBF) for large dynamic ranges. A resonant wavelength induced by the transverse coupling between modes and is used as characteristic realizing RI sensor. The numerical results show that linear correlation analyte can be significantly improved optimizing structural parameters of layer, which would beneficial to enlargement measurement range. Furthermore, we numerically...

We comparatively investigate the modal properties of guided modes in hollow core Bragg fibers (HC-BFs) with binary and ternary photonic bandgap claddings by using a full-vector finite element method. The influences structural changes from periodic cladding (BPC) to (TPC) on dispersion relations, confinement losses, field distributions lowest five are thoroughly discussed under different diameters. contrasts bandwidths for between both types HC-BFs strongly depend their distinct frequency...

The effects of a homogenisation treatment on precipitation, recrystallisation, grain refinement and texture in an Al–1.2Mn alloy were investigated. Based hardness electrical conductivity measurements, precipitation–recrystallisation diagram was generated, which described the sequence recrystallisation precipitation. results showed that significantly retarded during annealing for cold-rolled alloys with supersaturated solid solution or dense pre-existing dispersoids. If precipitation occurred...

We propose a hole-assisted solid core Bragg fiber (SCBF) with high-index-contrast cladding for near-infrared broadband single-polarization transmission in this article. The circular symmetry of common SCBF is broken by the introduced air holes increasing modal birefringence and polarization-dependent loss (PDL). In proposed SCBF, confinement guided modes predominantly depends on photonic bandgap effect from cladding, simultaneously rests total internal reflection interface between holes....

This paper mainly presents a facile and cost-effective method to achieve large-scale ZnO nanocap (ZnO NC)-ordered arrays with controllable amount of Au nanoparticles (Au NPs) decorated on their surface. The preparation process includes the construction polystyrene nanosphere (PS) mask, metal deposition, annealing process. NPs/ZnO NCs have apparent hierarchical structure. Interestingly, size number NPs can be controlled by changing time deposition diameter PSs. Moreover, NP/ZnO NC used as...

Liquid-filled hollow core Bragg fibers (HCBFs) provide an excellent platform for refractive index (RI) sensing. The capacity high-RI sensing based on higher order bandgaps of HCBF is explored sensitivity. We numerically compare the performances As <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> S xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> /PEI-based RI sensor using first-order and second-order photonic (PBGs) influences material...

Hollow core Bragg fibers (HC-BFs) with a conventional multilayered cladding or defect layer are employed to realize miniaturized and highly sensitive fluorescence sensor. The performance of our proposed sensor strongly depends on the large HC-BF that simultaneously acts as sample cell, collector filter for noisy excitation light. Notably, both photonic bandgap effect transverse resonant behavior can be used filtering light mixed in fluorescence. Finally, two presented examples verify...

We propose a refractive index (RI) sensor based on liquid-filled defect hollow core Bragg fiber (DHCBF) for high sensing, in which resonant wavelength resulted from the transverse coupling effect between modes and is utilized as characteristic wavelength. The linearity sensitivity strongly depend structural parameters of layer. Accordingly, we numerically demonstrate RI with 753nm/RIU large range 1.477 to 1.645, by optimally designing layer DHCBF. 532nm/RIU slightly higher still can be...

We propose a highly-birefringent solid-core Bragg fiber (SC-BF) with high-index-contrast cladding by symmetrically introducing two air holes into the solid core. The birefringence properties of such SC-BF and their influencing factors are numerically investigated using finite element method. numerical results show that modal can be effectively improved optimizing refractive index, size position holes. demonstrate 2.43×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

As a class of hollow core photonic bandgap fiber (HC-PBGF), Bragg fibers (HC-BFs) with broadband transmission for multi-component trace-gas sensing have attracted much interest in recent years. In this paper, we numerically investigate the PBG characteristics HC-BFs conventional periodic cladding (CPC) and our previously proposed linearly-chirped (LCC). The results show that LCC structure is more suitable broadening omnidirectional (OPBG) range by regulating linear increment period or layer...