Abstract At present, most of lead halide perovskite quantum dots (PQDs) embedded in an enclosed organic polymer or glass matrix can achieve high water stability, yet this limits their subsequent integration with light‐emitting diodes (LEDs) and other functional materials. Herein, a postadsorption process using superhydrophobic aerogel inorganic (S‐AIM) open structures is presented to enhance stability PQDs compose new functions them such as magnetism. The CsPbBr 3 integrated the S‐AIM...

Angular color uniformity (ACU) is a key factor used to evaluate the light quality of white-light emitting diodes (LEDs). In this study, novel double remote micro-patterned phosphor film (double RMPP film) was enhance ACU (RP) down-light lamp. A conventional RP and with single (single also were examined for comparison. The angular correlated temperature (CCT) distributions optical performance films experimentally measured. measurement results showed that configuration exhibited better CCT...

We demonstrate an ultrasonication-assisted synthesis without polar solvent of CsPbBr 3 and Cs 4 PbBr 6 perovskite nanocrystals (PNCs) their reversible transformation. The as-prepared PNCs exhibit different optical properties that depend on morphology, size, structure. photoluminescence (PL) emission quantum yield (QY) the can be tuned by changing ultrasound power, radiation time, height vibrating spear. optimized show a good stability high PL QY up to 85%. In addition, phase transformation...

Based on electrospinning technology, in this study, we fabricated poly(lactic-co-glycolic acid) (PLGA) nanofiber films with high reflectivity and scattering properties. Various different thicknesses fiber diameters were by changing the time solution concentration, respectively. Detailed optical measurements demonstrate that film reflectance ability increase thickness, whereas diameter contributes little to both With optimized thickness diameter, feature whiteness a of 98.8% compared BaSO4...

Polyacrylonitrile electrospinning nanofiber film was introduced into a light emitting diode (LED) lamp to exploit the strong reflective and scattering effects. The extraction mechanism studied systematically for three different types in of LED lamps. For all-electrospinning types, luminous efficacy increased white LED, outwards remote phosphor layer, inwards layer lamps by 10.98, 16.97, 18.35%, respectively, compared with reference lamp. Lamps stronger backscatter had larger enhancements....

The color uniformity (CU) of chip-on-board (COB) white light emitting diodes (WLEDs) has been improved by using remote phosphor films with two freeform surfaces (TFS-RPFs). finite-difference time-domain (FDTD), Monte Carlo ray-tracing, and color-thickness feedback (CTFB) methods were used to design the TFS-RPFs: blue distribution COB WLEDs is greatly affected angular thickness TFS-RPFs, a high CU can be achieved iteratively. directional inconsistency incident emergent light, scattering...

We develop a facile, fast, and cost-effective method based on the electrowetting effect to fabricate concave microlens arrays (MLA) with tunable height-to-radius ratio, namely aspect ratio (AR). The electric parameters including voltage frequency are demonstrated play an important role in MLA forming process. With optimized of 5 Hz, AR tuned from 0.057 0.693 for increasing 0 V 180 V. optical properties MLA, their transmittance light diffusion capability, investigated by spectroscopic...

Currently, laser-driven lighting based on phosphor-in-glass (PIG) has drawn much interest in solid state due to its high electro-optical efficiency and high-power density. However, the fabrication of PIG requires expensive equipment, long sintering time, cost. In this work, we utilized a simple, fast, temperature Joule heating process make bulk sintered less than 20 s, which greatly improved production efficiency. The converters under different temperatures were investigated experimentally....

Abstract Pixelated color convertor plays an immensely important role in next‐generation display technologies. However, the inherent randomness of light propagation within presents a formidable challenge to reconcile huge contradiction between excitation and outcoupling. Here, we demonstrate bioinspired photonic waveguide pixelated (BPW‐PCC) realize directional outcoupling, which is inspired by insect visual system. The lens array BPW‐PCC enables focusing that guides converges it on colloidal...

Optical diffusers with combined high transmittance and haze are desired for the light management of various optoelectronic devices. However, fabrication such optical is still a grand challenge, limiting wide application diffusers. Herein, technique by combining polymerization‐induced phase separation (PIPS) postpolymer encapsulation to make composite particle‐free proposed, achieving haze. By altering composition two porogens, morphology porous structure can be well tailored, which generates...

High-haze optical polymer diffusers have attracted great attention in terms of application surface color-conversion films for lighting and displays. An diffuser based on polystyrene-fiber rods (PFRs) dispersed polydimethylsiloxane (PDMS) resin is presented this study. Using a simple electrospinning emulsion shear fabrication process, composite having diffusion properties were fabricated owing to index-mismatching between the PFRs PDMS. During mechanical shearing, it demonstrated that...

Abstract Water‐soluble conductive polymer poly(3,4‐ethylenedioxythiophene)/polystyrene sulfonate (PEDOT:PSS) has a broad application prospect in the field of flexible wearable electronics, but simple and efficient manufacture patterned PEDOT:PSS electrodes is still challenging. In this paper, PEDOT:PSS‐flexible electrode with electrospinning nano‐fiber substrate proposed. The produced by hydrophobic polyvinylidene difluoride (PVDF) matrix material loaded TiO 2 UV‐induced...

Quantum dots (QDs) attract great attention due to their narrow emission spectra, providing excellent light quality for light-emitting diodes (LEDs) in illumination and display applications. However, low thermal reliability suppresses the commercial applications of QD-based LEDs. In this report, it is first time that we realize high performance LEDs with watt-level injection power. The QD-on-reflector (QOR) structure proposed separate QDs from heat source chips, targeted cooling QD/polymer...

Whiteness is an intriguing property in some creature surfaces and usually originates from broadband multi-scattering by the refined structures. In this article, we report that Boehmeria nivea, a widely distributed tropical subtropical plant, has highly reflective layer on lower surface of leaf. Morphological characterization demonstrates consists numerous wrinkled micro-filaments, forming disordered porous network to efficiently scatter visible light. Moreover, white shown exhibit protection...

Even though chip-on-board light-emitting diodes (COB LEDs) with quantum dots (QDs) are attracting much attention for their high optical performance, luminous efficiency (LE) is still low owing to total internal reflection. To overcome this problem, in study, a microfiber-silicone hybrid (MFSH) structure proposed enhance the LE of QD-based COB LEDs. Polystyrene (PS) fiber films were fabricated by electrospinning and subjected planar compression modeling precisely control film thickness....

The inverted dispensing (ID) method is proposed to fabricate remote phosphor layers (RPLs) with cone-like shapes for white light-emitting diodes (WLEDs) improve their color uniformity. We introduce surface evolver packages and optical simulations study the effect of tension on performance these WLEDs during ID process. results show that a decreasing contributes sharpened geometry RPL. This responsible optimization uniformity by deflecting blue light towards central angles. simple efficient....

A high ambient contrast ratio (ACR) and brightness are critical for realizing dynamic range (HDR) in advanced display applications. However, improving the ACR while maintaining light output devices is still challenging. To solve this issue, we proposed a laminated interlaced microgroove (LIM) Janus structure, consisting of intersecting microgrooves cutting through extinction scattering layers, leading to highly improved with less optical loss devices. Optical simulation was performed...

In this study, a strongly reflective and photoluminescent (PL) poly(lactic-co-glycolic acid) quantum dot (QD) hybrid nanofiber (PQHN) structure is introduced to enhance the luminous efficacy of QD-phosphor white light-emitting diodes (QD-WLEDs). As thickness PQHN film increases, PL found continuously increase, exhibiting maximum peak intensity at 120 μm, which 1.92 times that 12 showing highest diffuse reflectance 94.4% 640 nm. Consequently, while using QD-WLEDs, achieves 53.8% improvement...

A composite method combining energy and intensity mapping is proposed to address the issue of surface error caused by irregular sampling phenomenon in freeform illumination lens design. In combined method, central region designed whereas peripheral energy-mapping method. Furthermore, an iterative feedback optimization added scale out application extended light sources. As evaluating example, a with 120-deg viewing angle, fitted appropriate number points Compared that forms more uniform on...

Optical Diffusers In article number 2100185 by Shudong Yu and co-workers, composite particle-free optical diffusers with combined high transmittance haze are developed using polymerization-induced phase separation polymer encapsulation techniques. The as-prepared can scatter incident light from light-emitting diodes very efficiently homogeneously, demonstrating their outstanding light-diffusing performance.