Abstract Perovskite quantum dots (PQDs) are a competitive candidate for next‐generation display technologies as result of their superior photoluminescence, narrow emission, high yield, and color tunability. However, due to poor thermal resistance instability under energy radiation, most PQD‐based white light‐emitting diodes (LEDs) show only modest luminous efficiency ≈50 lm W −1 short lifetime <100 h. In this study, by incorporating cellulose nanocrystals, new type QD film is fabricated:...

A simple printed multiband antenna with parasitic-element design for multi-standard handheld terminals in mobile communications is presented. The proposed performs three resonance modes covering six bands of wireless standards, including GSM, GPS, DCS, PCS, UMTS, and LTE 2300/2500. In geometry, the simply consists two metal stubs. One an L-shaped driven stub working as a feeder embedded transmission line. other U-shaped parasitic radiator. With fully configuration, cost effective...

Color gamut is of the paramount importance in display.Light-current-voltage(L-I-V) characteristics red, green, and blue flip-chip mini-light-emitting diodes (LEDs) (100 μm × 200 μm) are investigated at temperatures similar to operational temperatures. Both ideality factor temperature dependence external quantum efficiency (EQE) suggest that nonradiative loss red mini-LED higher. We also illustrate intensive lateral luminous intensity fluctuation for under over-driving current by capturing...

We employ dissipative particle dynamics (DPD) to examine the effects of composition and interaction parameter on resulting phase behavior $ABC$ star copolymers. Here, we assume that parameters among three components are equal. When have comparable volume fractions, our DPD results illustrate unique formation various types three-phase separated polygonal cylinders is mainly dominated by but not influenced parameter. In contrast, when two minor, morphology type greatly Generally speaking, with...

This study developed flexible light-emitting diodes (LEDs) with warm white and neutral light. A simple ultraviolet flip-chip sticking process was adopted for the pumping source combined polymer quantum dot (QD) films technology to yield The polymer-blended LEDs exhibited higher luminous efficiency than QD-blended LEDs. Moreover, achieved excellent color-rendering index (CRI) values (Ra = 96 R9 96), high reliability, demonstrating suitability special applications like accent, down, or...

To realize high-efficiency, AlGaN-based, deep-ultraviolet light-emitting diodes (DUV-LEDs), enhancing their light-extraction efficiency and reducing thermal resistance is very crucial. We proposed a liquid packaging structure that could enhance optical power by 27.2% 70.7% for flat type lens 281-nm DUV-LEDs, respectively. A significant improvement effect at different wavelengths, such as 268 nm 310 nm, was also observed. Furthermore, using the structure, reduced 30.3% compared to...

In this study, we present a novel type of package, freeform-designed chip scale package (FDCSP), which has ultra-high light extraction efficiency and bat-wing field. For the backlight application, mainstream solutions are chip-scale (CSP) surface-mount device (SMD). Comparing with these two types CSP, SMD, FDCSP 88%, 60%, 96%, respectively. addition to efficiency, because 160-degree field, could provide thinner low power consumption mini-LED solution smaller number LEDs than CSP SMD source array.

We demonstrate excellent color quality of liquid-type white light-emitting diodes (WLEDs) using a combination green CsPbBr3 and red CdSe/ZnS quantum dots (QDs). Previously, we reported (CsPbBr1.2I1.8) (CsPbBr3) perovskite QDs (PQDs)-based WLEDs with high gamut, which manifested fast anion exchange stability issues. Herein, the replacement PQDs has resolved aforementioned problems effectively improved both efficiency. Further, proposed device possesses outstanding gamut performance (132%...

The linewidth enhancement factor α of a semiconductor laser under the influences optical feedback with different strengths, external cavity lengths, and phases are studied both experimentally theoretically. value is determined from minimum Hopf bifurcation curve when subject to injection. In experiment, pellicle beamsplitter mounted on PZT stage placed linear translation used as reflector, where length can be adjusted continuously long regime short phase accuracy. With moderate strength,...

To realize high-efficiency AlGaN-based deep-ultraviolet light-emitting diodes (DUV-LEDs), enhancing their light-extraction efficiency (LEE) is crucial. This paper proposes an aluminum-based sidewall reflector structure that could replace the conventional ceramic-based packaging method. We design optimization simulations and experimental results demonstrated light power output be enhanced 18.38% of DUV-LEDs packaged with sidewall.

The low luminance efficiency, poor reliability and parasitic peaks have greatly limited the commercialization of deep ultraviolet (DUV) light-emitting diodes. Tasks identifying culprits these deficits are paramount importance but remains unaccomplished. We employ full-range temperature (20 K -300 K) measurement on 275-nm DUV devices that subjected to a 15-hour current-stress aging. results suggest primary culprit fast luminous decay is proliferation non-radiative centers. origins two main...

We apply a four-wave mixing analysis on quantum dot laser to simultaneously obtain the linewidth enhancement factor α and other intrinsic parameters. By fitting experimentally obtained regenerative signals power spectra at different detuning frequencies with respective curves analytically calculated from rate equations, parameters including factor, carrier decay in dots, differential gain, photon can be determined all once under same operating conditions. In this paper, theoretical model for...

Abstract The physiological regulation of Oestrogen receptor α (ERα) and peroxisome proliferator‐activated alpha (PPARα) in Hepatocellular carcinoma (HCC) remains unknown. present study we first treat the cells with fenofibrate further investigated possible mechanisms 17β‐estradiol (E 2 ) and/or ERα on regulating PPARα expression. We also found higher expression tumor area than adjacent areas subsequently compared four different hepatic cancer cell lines. Hep3B were to express more other...

Hepatocellular carcinoma (HCC) metastasis is often associated with the activation of Wnt/β-catenin signaling pathway. Zanthoxylum avicennae (Ying Bu Bo, YBB), a traditional herb hepatoprotective effect, has been proven to inhibit human HCC in vivo models however, vitro and effect YBB on tumor not clear yet. To determine whether could HA22T cell by acting β-catenin metastatic vivo, cells were treated different concentrations extracts (YBBE) analyzed Immunofluorescence staining assay, western...

This paper proposes a new encapsulation structure for aluminum nitride-based deep UV light-emitting diodes (DUV-LEDs) and eutectic flip chips containing polydimethylsiloxane (PDMS) fluid doped with SiO2 nanoparticles (NPs) UV-transparent quartz hemispherical glass cover. Experimental results reveal that the proposed has considerably higher light output power than traditional one. The extraction efficiency was increased by 66.49% when forward current of DUV-LED 200 mA. Doping PDMS NPs...

High-brightness white-light-emitting diodes (w-LEDs) with excellent color quality is demonstrated by using nontoxic nanomaterials. Previously, we have reported the high w-LEDs heavy-metal phosphor and quantum dots (QDs), which may cause environmental hazards. In present work, liquid-type white LEDs composed of materials, named as graphene porous silicon are fabricated a rendering index (CRI) value gain up to 95. The liquid-typed device structure possesses minimized surface temperature 25%...

Abstract The phase behaviors, molecular conformations, and structural length scales of Y‐ (AB 2 ), H‐ (B AB π ‐shaped [B(A)B(A)B] copolymers are compared using dissipative particle dynamics. Though their diagrams similar, the stability microstructures is enhanced with increasing complexity architecture (linear → Y H or ). In addition, greater entropy loss associated disorder‐to‐order transition for architectures makes it more difficult them to undergo a microphase separation. When molecules...

We derive a simplified rate equation model for the four-wave mixing (FWM) analysis on quantum dot (QD) semiconductor lasers subject to optical injection. The regenerative and amplitude modulation spectra of FWM signals with different intrinsic laser parameters external injection conditions are investigated. By curve fitting obtained experimentally, commercial single-mode QD under extracted. linewidth enhancement factor α at levels detunings shown, where reduction up 39% from its free-running...

In this paper, we will review our lab's result on using photoresist as the masking material for micro‐LED arrays. The colloidal quantum dots (QDs) are used photon conversion layer and Aerosol Jet ® technology was applied dispensing QDs. A full‐color array can be demonstrated isolation between pixels improved. output light intensity also improved via inclusion of a ultra‐violet band distributed Bragg reflector (DBR).

This study presents a novel method for estimating the phosphor conversion efficiency of white light-emitting diodes (WLEDs) with different ratios phosphors. Numerous attempts have been made predicting WLEDs using Monte Carlo ray tracing and Mie scattering theory. However, because depends on concentration, obtaining tight match between this model experimental results remains major challenge. An accurate prediction various parameters, including particle size, morphology, packaging process...

In conclusion, a novel planar PCB multiband antenna with parasitic element is proposed in this paper. Using only two simple radiating elements, the operates three separate resonant modes, covering six popular communication bands. The area occupies small physical space (18 times 37 0.6 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> ). This structure makes fabrication very cost effective. performs stable gain level and omni-directional...