Solid‐State Lighting: Toward Smart and Ultraefficient Materials, Devices, Lamps, and Systems

Crawford, Mary H.; Wierer, Jonathan J.; Fischer, Arthur J.; Wang, G. T.; Koleske, Daniel; Subramania, Ganapathi Subramanian; Coltrin, Michael E.; Karlicek, R. F.; Tsao, Jeffrey Y.

doi:10.1002/9781119011781.ch1

Cited by 6 publications

(6 citation statements)

References 115 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…- Biard andPittman (1961-1962): made experiments on GaAs substrate and found infra-red light emission (19) then they later filed a patent titled "Semiconductor Radiant Diode" based on their discoveries, this patent was about emitting light from a gallium arsenide semiconductor with a near infrared spectrum wave length (20) . In October 1962, Texas instruments announced the first initially LED commercial product (the SNX-100) which is based a pure GaAs crystal transmitting a 900nm light output (21) shown in fig.…”

Section: History Of Led Developmentmentioning

confidence: 99%

Using Illuminative Technology in Creating Fashion Designs for Women Evening Wear Collections

Mohamed

Mustafa²

2016

International Design Journal

View full text Add to dashboard Cite

Fashion designers have always been using new technologies to design and submit their collections, the Light Emitting Diode (LED) became from the most popular technologies used nowadays, and they can be used as a decorative item besides beads and sequins or solely adding new aesthetic values. So the researcher overviewed this technology and it's usage in fashion in the past years also used this technology to create two women's wear collections for spring summer and executed four designs evaluated and judged as the best designs by experts in the fashion field though a designed questionnaire, in addition, the researcher clarified the methodology of how LEDs could be installed into the executed garments also measured the visible light transmission values of the fabrics used and tested the changes that LEDs could cause on the physical properties and colors of the fabrics used in the executed garments by performing bursting strength test, maximum force and elongation test, color reflectance and K,/S tests after exposing the fabrics to LED lights for 80, 110 and 140 hours. Research problem: 1-How do the LEDs affect the fabrics used in special occasion's women's wear? 2-What is the possibility of using LEDs to enrich the aesthetic and functional values of women's special occasions clothing designs? 3-What are the techniques of installing LEDs into women's clothing? Research importance: 1-Mentioning the usages of LEDs in fashion design. 2-Enlighten an important side of fashion design which is combining clothes with modern technological techniques by applying LEDs to performance garments and evening gowns as a decorative ornament along with beads, reflecting surfaces to create decorative shapes according to the LEDs arrangement. 3-Mentioning different techniques, tools, knowledge, styles and skills of designing and producing the light up garments. 4-Mentioning the effect of LED installation on certain fabrics used in fashion design.

show abstract

Section: History Of Led Developmentmentioning

confidence: 99%

Using Illuminative Technology in Creating Fashion Designs for Women Evening Wear Collections

Mohamed

Mustafa²

2016

International Design Journal

View full text Add to dashboard Cite

show abstract

“…The conversion efficiency, however, is not 100%, and there is always heat generated as a product of energy loss. So far, as high as 40% of electrical power can be converted to light [9]; this number is expected to be higher as the LED technology becomes more mature. Heat generated inside LEDs must be effectively released out of the system to the environment; otherwise the LED's operating temperature will become higher and higher.…”

Section: Introductionmentioning

confidence: 99%

LED's luminous flux lifetime prediction using a hybrid numerical approach

Kijkanjanapaiboon

Kretschmer

Chen

et al. 2015

2015 16th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and

View full text Add to dashboard Cite

Light-emitting diodes (LEDs) have several advantages over traditional incandescent bulbs and compact fluorescent lamps, such as superior energy efficiency, environmental friendliness, and particularly long lifetime (between 25,000 to 100,000 hours). However, this long lifetime of LED proves inconvenient to manufacturers for conducting reliability tests which require the same amount of time to conclude. To overcome such inconvenience, this paper presents a hybrid numerical approach that combines numerical modeling with analytical analysis to predict the lifetime of LEDs. In this paper, a 60W-equivalent lOW phosphor-converted white LED bulb is studied by two numerical approaches. A one dimensional (I-D) thermal-resistance circuit analysis and a three-dimensional (3-D) hybrid finite element analysis (FEA) are employed to estimate the LEDs' junction temperature in accord to the data obtained through the experiment. The numerical results showed that both I-D thermal-resistance circuit and the hybrid FEA model are in agreement with the experiment data, thus invaluable to manufacturers who need to carry out reliability testing. Then the estimated junction temperature is used to determine the LED luminaire's lifetime according to the known LM-80 database and TM-21 method.

show abstract

“…Solid-state lighting based on phosphor-converted LED (pcLED) packages has become an important platform for highly efficient lighting. − In such pcLED packages, green and red phosphors are deposited directly onto high intensity GaN LED chips that emit blue light at 450 nm. These phosphors absorb a portion of the blue light, and the net LED plus phosphor emission spectra can be well-matched to emission from traditional incandescent light sources. − This design places significant thermal and optical stress on the phosphors, for they are in direct contact with the GaN LED chip and are subject to intense (0.1–1 W/mm 2 ) optical irradiation and high temperatures (∼150 °C or more). , …”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Energy Transfer and Enhanced Stability of Carbidonitride Phosphors for Solid-State Lighting

Grieco

Hirsekorn

Heitsch

et al. 2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Phosphor-converted light emitting diodes (pcLEDs) produce white light through the use of phosphors that convert blue light emitted from the LED chip into green and red wavelengths. Understanding the mechanisms of degradation of the emission spectra and quantum yields of the phosphors used in pcLEDs is of critical importance to fully realize the potential of solid-state lighting as an energy efficient technology. Toward this end, time-resolved photoluminescence spectroscopy was used to identify the mechanistic origins of enhanced stability and luminescence efficiency that can be obtained from a series of carbidonitride red phosphors with varying degrees of substitutional carbon. The increasing substitution of carbon and oxygen in nitrogen positions of the carbidonitride phosphor (SrSiNCO:Eu) systematically changed the dimensions of the crystalline lattice. These structural changes caused a red shift and broadening of the emission spectra of the phosphors due to faster energy transfer from higher to lower energy emission sites. Surprisingly, in spite of broadening of the emission spectra, the quantum yield was maintained or increased with carbon substitution. Aging phosphors with lowered carbon content under conditions that accurately reflected thermal and optical stresses found in functioning pcLED packages led to spectral changes that were dependent on substitutional carbon content. Importantly, phosphors that contained optimal amounts of carbon and oxygen possessed luminescence spectra and quantum yields that did not undergo changes associated with aging and therefore provided a more stable color point for superior control of the emission properties of pcLED packages. These findings provide insights to guide continued development of phosphors for efficient and stable solid-state lighting materials and devices.

show abstract

Solid‐State Lighting: Toward Smart and Ultraefficient Materials, Devices, Lamps, and Systems

Cited by 6 publications

References 115 publications

Using Illuminative Technology in Creating Fashion Designs for Women Evening Wear Collections

Using Illuminative Technology in Creating Fashion Designs for Women Evening Wear Collections

LED's luminous flux lifetime prediction using a hybrid numerical approach

Mechanisms of Energy Transfer and Enhanced Stability of Carbidonitride Phosphors for Solid-State Lighting

Contact Info

Product

Resources

About