scholarly journals High speed transmission of signal level for white light emitting diode (LED) as a transmitter device by using modified phase equalization

2020 ◽  
Vol 17 (3) ◽  
pp. 1348
Author(s):  
Maad Mohsin Mijwil
Keyword(s):  
White Light ◽  
Communication System ◽  
High Speed ◽  
Finite Impulse Response ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
White Led ◽  
Light Emitting ◽  
System Data ◽  
Two Phases

Visible light communication (VLC) also known as "Li-Fi", uses standard LEDs to transmit data such as information, images, music, and videos. The first LED was developed in 1927 by Oleg Vladimírovich Lósev (1903-1942), however it was not used in the industry until the 1960s.In this paper, will describe the implementation of Modified Phase Equalization (MPH) on visible white LED lamps signal because it's has slow transition time that severely limits in the communication system data speeds with phase equalization that increases the bandwidth of the LED modulation. Employ two filters with Modified Phase Equalization: first, Complementary (C) filter to combine between all kinds moving signals and second, finite impulse response (FIR) filter to obtain all coefficients that respective. Implementation in two phases: first, frequency 150KHz with number of signals 15000 signals and second, doubling frequency 300KHz with number of signals 30000 signals of LEDs without losing their main functionality as illumination sources.

Ultra-high-speed single red–green–blue light-emitting diode-based visible light communication system utilizing advanced modulation formats

2014 ◽  
Vol 12 (1) ◽  
pp. 010605-10608 ◽  
Author(s):  
Nan Chi Nan Chi ◽  
Yuanquan Wang Yuanquan Wang ◽  
Yiguang Wang Yiguang Wang ◽  
Xingxing Huang Xingxing Huang ◽  
Xiaoyuan Lu Xiaoyuan Lu
Keyword(s):  
Visible Light ◽  
Blue Light ◽  
Communication System ◽  
High Speed ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
Modulation Formats ◽  
Light Emitting ◽  
Ultra High Speed ◽  
Advanced Modulation Formats

Portable visible light communication transmitter and receiver using core-shell CdSe/ZnS quantum dots white light-emitting diode

2019 ◽  
Vol 13 (7) ◽  
pp. 873-878
Author(s):  
Ziwen Li ◽  
Dingke Xue ◽  
Dayong Liu ◽  
Yang Liu ◽  
Weilin Ye ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Visible Light ◽  
White Light ◽  
Light Emitting Diode ◽  
Visible Light Communication ◽  
Core Shell ◽  
Light Emitting

A high quality liquid-type quantum dot white light-emitting diode

Nanoscale ◽  
2016 ◽  
Vol 8 (2) ◽  
pp. 1117-1122 ◽  
Author(s):  
Chin-Wei Sher ◽  
Chin-Hao Lin ◽  
Huang-Yu Lin ◽  
Chien-Chung Lin ◽  
Che-Hsuan Huang ◽  
...  
Keyword(s):  
Quantum Dot ◽  
White Light ◽  
Light Emitting Diode ◽  
White Led ◽  
High Quality ◽  
Light Emitting ◽  
Uv Led ◽  
Liquid Type ◽  
Color Conversion

In this study, a liquid-type QD white LED is demonstrated as an efficient color-conversion layer in UV LED packages.

Dependence of Yellow Phosphor on Optical and Electrical Properties of the White Light Emitting Diode Chip

2006 ◽  
Vol 510-511 ◽  
pp. 106-109 ◽  
Author(s):  
Chang Sik Son ◽  
Ho Jung Chang ◽  
Kang Hyun Jaekal ◽  
Young Chol Chang ◽  
Soo Wohn Lee
Keyword(s):  
Electrical Properties ◽  
Bias Voltage ◽  
White Light ◽  
Light Emitting Diode ◽  
White Led ◽  
Optical And Electrical Properties ◽  
Maximum Luminance ◽  
Mixing Conditions ◽  
Light Emitting ◽  
Yellow Phosphor

We prepared the surface mounted white light emitting diode (LED) chips by using yellow phosphors on the blue LED chip. The optical and electrical properties of prepared white LED chips were investigated. The yellow phosphor mixed with transparent epoxy was coated on the prepared LED chip. The optimum mixing conditions with epoxy and yellow phosphor is obtained at the mixing ration of epoxy: yellow phosphor = 97 : 3 wt %. The maximum luminance and light emitting efficiency are above 80,000 cd/m2 and 23.2 lm/W, respectively, at the bias voltage of 2.9 V. There was no distinct change in the luminance strength with changing of the yellow phosphor ratios. The flowing current of the white LED chip is about 30 mA at 2.9 V.

Effects of Different Package Structures on Thermal Properties of High Power White LED

2012 ◽  
Vol 503 ◽  
pp. 397-401 ◽  
Author(s):  
Zhe Ran Sun ◽  
Da Ming Wu ◽  
Ya Jun Zhang ◽  
Jian Zhuang ◽  
Kai Fang Dang
Keyword(s):  
Thermal Properties ◽  
Thermal Resistance ◽  
White Light ◽  
High Power ◽  
Light Emitting Diode ◽  
White Led ◽  
Forward Voltage ◽  
Light Emitting

The characteristics of several package structures of high power white Light emitting diode (LED) are described in this paper. The influence of different structures on thermal properties is analyzed. Forward voltage method is used to test the thermal resistance of LED chips.

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