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We demonstrate efficient third harmonic generation from a 21.6nm-thick indium tin oxide film on glass substrate for a pump fundamental wavelength of 1350nm using the field enhancement properties of optical modes supported by epsilon-near-zero media.
This study examines the use of a diffusion barrier layer of Ti/TiN composite structures on 430 SS substrates. Secondary ion mass spectrometer (SIMS) measurements indicated that the Ti/TiN composite structure efficiently blocked Fe diffusion. An appropriate composition of sodium (Na) in the CIGS absorption layer improved the open-circuit voltage and fill factor (FF) in CIGS solar cells. An optimal...
White light emitting diodes (LEDs) with microstructure array on top surface of the phosphor silicone layer are demonstrated to have enhanced the light extraction efficiency (LEE) compared with white LEDs with flat phosphor layer. The effects of microstructure array on the LEE of LEDs are investigated by ray tracing simulations and experiments. Simulation results reveal that spherical cap microstructure...
YAG: Ce phosphor is widely used in LED industry with powder form to mix with silicone. The phosphor particle size is important by affecting optical performance of white LEDs in terms of luminous flux and angular color uniformity. This paper constructed a white LED optical model referring to CREE white LEDs. The optical simulation reveals that 2 μm phosphor particle presents the lowest luminous flux...
Low light extraction efficiency (LEE) is one of the most challenging points for light-emitting diode (LED) array packaging. Analysis of LEE enhancement of LED array packaging with micro-structures on packaging silicone is presented. To obtain high LEE, micro-structures including inversed cone, inversed frustum of a pyramid (FP) and V-groove are introduced. Two types of LED chips consisting of conventional...
To analyze the effect of moisture on the reliability of LED modules, diffusivity of packaging materials must be provided. Polycarbonate (PC) is an important material for LED lens. Its diffusivity measurement is usually based on the solution of one-dimensional diffusion. In this paper, the diffusivity measurement of PC was conducted. Simulation and analytical close-form solution (CFS) were also used...
The state of phosphor will greatly influence the packaging performance such as luminous efficiency, quality of white light and color uniformity. The analysis presents that the small variations of thickness and concentration could significantly influence the light extraction efficiency and the correlated color temperature (CCT). With the increase of thickness and concentration, the light extraction...
High power LED packaging is crucial for the development of solid state lighting. Different optical structures with various states of phosphor will greatly influence the packaging performance such as luminous efficiency, quality of white light and color uniformity. Through the analysis of five different optical structures, it is found that the location of phosphor layer has low impact on the light...
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