Session Index

Vertical GaN high-electron-mobility-transistor (HEMT) was demonstrated. The device using 2DEG (two-dimensional electron gas) as a conduction source and p-GaN to pinch off 2DEG. The device with threshold voltage (VTH) of -7.3V exhibits a maximum source-drain current of 1.5 mA/cm^2 and a current on-off ratio value of 103.

 

We investigate the plasmonic effects of copper nanoparticles (CuNPs) on quasi-two dimensional (2D) perovskite light-emitting diodes (PeLEDs). We blended CuNPs into the standard device to trigger the localized surface plasmon resonance (LSPR), luminance was increased from 1350 to 2410 cd/m2, current efficiency was improved from 2.7 to 5.8 cd/A.

 

We reported the temperature-dependent electroabsorption (E-A) and electrophotoluminescence (E-PL) spectra, that is, electric field-induced change in absorption and photoluminescence spectra of methylammonium lead tribromide quantum dots (QD), doped in a poly(methyl methacrylate) film in the temperature range of 40−290 K.

 

In this paper, different sizes of micro light-emitting diodes (micro-LEDs) were fabricated in order to understand the influence of the photoelectric characteristics of the micro-LED dies and the size structure of the components.

 

The effect of backward scattering in the packaging process was reduced by using a weight concentration of yellow phosphor of 7.5%. The properties including correlated color temperature, color rendering index and packaging efficiency were investigated. We can reduce the concentration of phosphor while still reach high packaging efficiency.

 

In this work, we report on WOLEDs with mCPCN as the host. Modulating the emitting layer thickness improves device color stability and the OLED demonstrates white light emission. The optimized device shows a current efficiency of 20.7 cd/A and a slight CIE coordinates variation of (±0.02, ±0.02) at 7-15 V.

 

The optimal trichromatic white LED spectra for mesopic lighting condition, which can increase the mesopic luminance and also expand the range of 3D color gamut with satisfying color rendering indices and acceptable Duv were proposed. The results indicated that a trade-off between mesopic luminance and color gamut was quite significant.

 

This work presents a sensor device with the freeform surface which is designed by the body-source-fixed freeform design algorithm. Utilizing this type of algorithm, the optical device could have the desired feature. The freeform-designed chip scale package is a suitable solution for the sensor application.

 

We demonstrate S21, 𝑓𝑇, 𝑓𝑚𝑎𝑥 and NFmin of AlGaN/GaN HEMTs with and without silicon substrate removal to compare the RF performance. The results show improved RF performances at high frequency and a decrease of parasitic effects due to silicon substrate removal. We achieve a better RF performance on low-resistivity silicon.

 

An AlGaN/GaN multi-shell nanorod structure is formed by using the self-catalytic pulsed growth process of MOCVD with Ga and Al/N supplies in the first and second half-cycles, respectively. With Al supply, a thin AlGaN layer is precipitated near the end of a growth cycle to form the core/shell structure.

 

We proposed a white LEDs using B-carotene based natural dye. The CCT decrease as the concentration of B-carotene based natural dye increasing. It is also found that the CRI of white LEDs using B-carotene based natural dye can be higher than 80.

 

The authors propose the use of tunnel junction (TJ) structure to cascade a green multiquantum well (MQW) active region and a blue MQW active region, and the fabrication of GaN-based dual-color light-emitting diodes (LEDs).

 

This study focuses on the wavelength of 280nm, adjusts the thickness and area of the package substrate. We was successfully obtained a UV-C LED disinfection light source on a flexible package with an area of 50×50 mm2 and a bend diameter of 3 cm.

 

This paper is mainly for the analysis of LED headlights with optical design meets the requirements of the regulations, but the optical performance doesn’t conform to the design result in actual production. We provide a treatment without changing the size of the optical mechanism molding to reduce the stray light.

 

An electroencephalogram characterization method utilizing the probabilistic neural network is developed for evaluating users’ attentiveness in different situations. The brainwaves were analyzed by using empirical mode decomposition and fast Fourier transform. Preliminary testing results showed high sensitivity in determining a brainwave belonging to the attention state or not.

 

We fabricated and compared the characteristics of InGaN-LEDs on sapphire substrate and (-2 0 1) β-Ga2O3 substrate, and the measurement results which include electroluminescence spectrum, and Light-Current-Voltage (LIV) curve.


 

we design the shape of the bulk optical diffuser (BOD) which has low scattering particle concentration for the anti-glare lamp to solve the spatial color non-uniform. Furthermore, the method has the higher optical efficiency than conventional methods of increasing the concentration of the BOD to enhance color temperature uniformity.

 

In this experiment, we measured the light transmission characteristics of solid
suspended particles (SSPs) emitted from the Taichung fossil-fuel power station at different
wavelengths and established the optical simulation of smog to analyze the influence of multispectrum LED in the haze environment

 

Present a calibration algorithm with decision tree concept to control the multi-spectrum LED according to different ambient light. The algorithm is used to calculate the color sensor's measurement results to identify the type of ambient light. Then modulate the multi-spectrum LED for the target of light color uniformity or compensation.