scholarly journals Optical Modeling Analysis of Red, Green, and Yellow Phosphors with a Blue LED

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Wen-Shing Sun ◽  
Chuen-Lin Tien
Keyword(s):  
Simulation Software ◽  
Color Temperature ◽  
Optical Simulation ◽  
Particle Model ◽  
Blue Led ◽  
Weight Percentage ◽  
Optical Modeling ◽  
Chromaticity Coordinate ◽  
Modeling Analysis ◽  
Cross Reference

The luminous properties of red, green, and yellow phosphors with a blue LED are evaluated and a corresponding optical model is constructed using the optical simulation software LightTools®. According to the phosphor particle model, the desired chromaticity coordinate of the multicomponent light which is excited by a blue LED can be achieved by modifying the weight concentration of the phosphors. A comparison of the four types of LED package modules tested shows that the yellow phosphor encapsulated with a semispherical module takes up a lesser percentage of the total weight percentage of a constructed white light with a correlated color temperature of around 4000 K. The simulation and experimental results provide a cross-reference for better packaging and encapsulating designs for lumen improvement.

scholarly journals Light Output, Thermal Properties, and Reliability of Using Glass Phosphors in WLED Packages

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 239
Author(s):  
Chin-Chuan Huang ◽  
Tsung-Han Weng ◽  
Chun-Liang Lin ◽  
Yan-Kuin Su
Keyword(s):  
Thermal Properties ◽  
Yttrium Aluminum Garnet ◽  
Saturated Vapor ◽  
Light Output ◽  
Junction Temperature ◽  
Color Temperature ◽  
Light Emitting ◽  
Chromaticity Coordinate ◽  
White Light Emitting Diodes ◽  
Color Rendering

White-light-emitting diodes (WLED) based on yttrium aluminum garnet (YAG) phosphors sintered with glass (PiG) and with silicone (PiS) are compared in terms of their light properties, temperature properties and reliability.The complete YAG phosphor was doped with an encapsulant traditional WLED (PiS WLED), and the WLED was covered with PiG (PiG WLED). PiG was made by sintering glass powder and YAG phosphor at the ratio of 87:13 (%), and the correlated color temperature (CCT) was 5564 K. The CCT of the PiG WLED with the YAG doping concentration of 8.5 wt.% approximated 5649 K. The initial light output of the PiG WLED was 6.4% lower than that of the PiS WLED. Under 1008 h and 350 mA aging, PiG WLED and PiS WLED’ light output, CCT and color rendering index variation rates were all within 1%. In the saturated vapor-pressure test, no sample exhibited red ink infiltration, light nor peeling between the encapsulant and the lead-frame. Compared with that of the PiS WLED, the junction temperature of the PiG WLED reduced from 88.4 °C to 81.3 °C. Thermal resistance dropped from 37.4 °C/W to 35.6 °C/W. The PiG WLED presented a better CIE (Commission Internationale de l’Eclairage) 1931 chromaticity coordinate (x,y) concentration and thermal properties than the PiS WLED.

Optical simulation software

2010 ◽  
Vol 4 (4) ◽  
pp. 256-257 ◽  
Author(s):  
Keyword(s):  
Simulation Software ◽  
Optical Simulation

scholarly journals Efficient Robust Design Optimization of Optical Systems

2019 ◽  
Vol 215 ◽  
pp. 02001
Author(s):  
Stephanie Kunath
Keyword(s):  
Design Optimization ◽  
Robust Design ◽  
Optical Design ◽  
Simulation Software ◽  
Robust Design Optimization ◽  
Optical Systems ◽  
Optical Simulation ◽  
Optimization Approach ◽  
Trade Off ◽  
Virtual Product Development

To accelerate the virtual product development of using optical simulation software, the Robust Design Optimization approach is very promising. Optical designs can be explored thoroughly by means of sensitivity analysis. This includes the identification of relevant input parameters and the modelling of inputs vs. outputs to understand their dependencies and interactions. Furthermore, the intelligent definition of objective functions for an efficient subsequent optimization is of high importance for multi-objective optimization tasks. To find the best trade-off between two or more merit functions, a Pareto optimization is the best choice. As a result, not only one design, but a front of best designs is obtained and the most appropriate design can be selected by the decision maker. Additionally, the best trade-off between output variation of the robustness (tolerance) and optimization targets can be found to secure the manufacturability of the optical design by several advanced approaches. The benefit of this Robust Design Optimization approach will be demonstrated.

Model prediction on the correlated color temperature of white LED based on chromaticity coordinate

2019 ◽  
Vol 216 ◽  
pp. 116652 ◽  
Author(s):  
Zizhuan Liu ◽  
Bobo Yang ◽  
Canyun Zhang ◽  
Yang Li ◽  
Jun Zou ◽  
...  
Keyword(s):  
Model Prediction ◽  
Color Temperature ◽  
White Led ◽  
Chromaticity Coordinate

Structure Improvement and Performance Analysis of a Coupling Component for Board-Level Photoelectric Interconnection

2014 ◽  
Vol 886 ◽  
pp. 361-364
Author(s):  
Jin Bo Yan ◽  
Zhao Hua Wu ◽  
De Jin Yan
Keyword(s):  
Systems Analysis ◽  
Coupling Efficiency ◽  
Engineering Application ◽  
Simulation Software ◽  
Optical Simulation ◽  
Analysis Program ◽  
Structure Improvement ◽  
And Performance ◽  
Board Level ◽  
Coupling Components

The paper took a structure improvement of a coupling component for board-level photoelectric interconnection and analyzed its coupling efficiency by stimulation. Firstly, it briefly introduced the commonly used coupling components, analyzed the coupling performance, and selected a coupling component to improve its structure. Secondly, it introduced methods to improve coupling components, such as 45-degree gold-plated cross section, and manufacturing ball lens on both the top and the bottom to increase the coupling efficiency of coupling components. Finally, the optical simulation software Advanced Systems Analysis Program was applied to analyze the coupling efficiency. The coupling efficiency of improved coupling component was increased. The analyses and results are significant in engineering application and guiding.

scholarly journals Color Temperature Tunable White-Light LED Cluster with Extrahigh Color Rendering Index

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Minhao Zhang ◽  
Yu Chen ◽  
Guoxing He
Keyword(s):  
White Light ◽  
Experimental Results ◽  
Color Temperature ◽  
Blue Led ◽  
Average Value ◽  
Red Led ◽  
Green Led ◽  
Color Rendering Index ◽  
Color Rendering

The correlated color temperature (CCT) tunable white-light LED cluster with extrahigh color rendering property has been found by simulation and fabricated, which consists of three WW LEDs (CCT = 3183 K), one red LED (634.1 nm), one green LED (513.9 nm), and one blue LED (456.2 nm). The experimental results show that this cluster can realize the CCT tunable white-lights with a color rendering index (CRI) above 93, special CRI R9 for strong red above 90, average value of the special CRIs of R9 to R12 for the four saturated colors (red, yellow, green, and blue) above 83, and luminous efficacies above 70 lm/W at CCTs of 2719 K to 6497 K.

scholarly journals The Application of Calcium Carbonate CaCO3 and Titania TiO2 for Color Homogeneity and Luminous Flux Enhancement in PC-LEDs

2021 ◽  
Vol 5 (2) ◽  
pp. 75
Author(s):  
Viet Tien Pham ◽  
Ngoc Hung Phan ◽  
Guo-Feng Luo ◽  
Hsiao-Yi Lee ◽  
Doan Quoc Anh Nguyen
Keyword(s):  
Anisotropic Scattering ◽  
Mie Scattering ◽  
Luminous Flux ◽  
Color Temperature ◽  
Optical Simulation ◽  
Development Method ◽  
Scattering Coefficients ◽  
Creative Commons ◽  
Mie Scattering Theory ◽  
Open Access Article

This article studies the development method of pc-LED, a phosphor-converted lighting emitting diode, with scattering enhancement particles (SEPs) at 7000 K correlated color temperature. The pc-LED is an advanced lighting solution that has been applied in many different categories; nonetheless, to keep up with the demands of modern lighting, the pc-LEDs need to enhance the color homogeneity and luminous flux. The detailed experiments on the two SEPs used in the articles are also presented. The experiments include combining each of these SEPs with a yellow phosphor Y3Al5O12:Ce3+ to test their properties and influences on the lighting of pc-LEDs. The scattering coefficients, the anisotropic scattering, the reduced scattering, and the scattering amplitudes at 450 nm and 550 nm are the subjects of SEPs study. The LightTools program is used to create the simulation of pc-LED, the results of the optical simulation will then be verified with the Mie-scattering theory. The findings of the research conclude that TiO2 particles are the best for the growth of color homogeneity while CaCO3 particles are effective in limiting the color deviation in correlated color temperature. Even though the SEPs benefit the lighting performance, their concentration must be managed to be under an acceptable amount to ensure desired results and avoid unwanted damages.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium provided the original work is properly cited.

Modeling, Analysis and Design of the Formula SAE Aerodynamics System

2020 ◽  
Author(s):  
Isaac Van Baren ◽  
Andrew Van Milligan ◽  
Scott Ashcraft ◽  
Stephen Rosser ◽  
Xiuling Wang
Keyword(s):  
Simulation Software ◽  
The Body ◽  
Analysis And Design ◽  
Formula Sae ◽  
System A ◽  
Venturi Effect ◽  
Modeling Analysis ◽  
Straight Line ◽  
Design Competition ◽  
Vehicle Chassis

Abstract This project developed a study on methods to increase downforce on the university’s Formula SAE vehicle by implementing a lightweight, efficient aerodynamic design. The team planned to improve the performance and reduce lap times of the vehicle with an undertray, which grants better wheel traction and stability while handling corners. Upon completion, the aerodynamic component would have allowed the PNW Motorsports team to more effectively compete at the FSAE design competition in the spring of 2020. While reducing drag, an undertray provides the capability to direct the air beneath the vehicle chassis in a way which adds “artificial weight” to the system. A pressure gradient of high magnitude is established between the two sides of the undertray, with a low negative pressure region found beneath the body. This design is based upon the principles of fluid dynamics, in particular the venturi effect through the use of nozzles and diffusers. In this fashion, the vehicle can receive the benefits of a heavier car around corners while maintaining the higher straight-line acceleration of a lighter car. This report describes the use of simulation software in the design of an undertray, as well as the approach to manufacture it. Two-dimensional benchmark cases were performed in the replication of results obtained in a literature search. Subsequently, the undertray model was optimized with CFD and FEA/FEM techniques to obtain a component that was prepared for manufacturing. An operating procedure was established to outline the complicated steps of its assembly. Finally, it provides future aerodynamics teams with a solid foundation upon which improvements can be made.

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