Proceedings ArticleDOI
Influence of injection current and ambient temperature on intensity and wavelength of low-power SMD LED
Muna E. Raypah,Mutharasu Devarajan,Fauziah Sulaiman +2 more
- pp 1-6
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TLDR
In this article, the effect of change in ambient temperature and injection current on SMD LED intensity and wavelength shift is reported, and detailed analyses show that the ambient temperature has a significant influence on optical characteristics of low-power surface-mounted LEDs.Abstract:
Low power surface-mounted (SMD) LEDs are paid much attention in research and development due to their portability and miniaturization. Optical characteristics of SMD LEDs have to maintain more accurate specifications in signaling applications such as traffic lights or railway. Current and temperature stabilization is important for attaining constant spectral properties of SMD LEDs. In this manuscript, the effect of change in ambient temperature and injection current on SMD LED intensity and wavelength shift is reported. Measurements were carried out using a spectrometer to record the LED optical parameters at various operating conditions. Detailed analyses show that the ambient temperature has a significant influence on optical characteristics of low-power SMD LED. The investigation of LED optical behaviors helps in choosing the appropriate working condition at the optimum level.read more
Citations
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Individual differences in visual science: what can be learned and what is good experimental practice?
TL;DR: This essay illustrates how individual differences contribute to a richer understanding of visual perception, but it also indicates some potential pitfalls that face the investigator who ventures into the field.
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Experimental modeling of the thermal resistance of the heat sink dedicated to SMD LEDs passive cooling
TL;DR: The vital role of passive heat dissipation in thermal management of low-power LED packaging is outlined and an appropriate model to evaluate the thermal resistance of the heat sink is given.
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Effect of Temperature on Channel Compensation in Optical Camera Communication
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Measurement of spectra of fiber Bragg gratings by tuning the wavelength of a laser diode
TL;DR: In this paper , the authors demonstrate the possibility of measuring the reflection spectra of fiber Bragg gratings by tuning the wavelength of an off-the-shelf laser diode.
Journal ArticleDOI
Solar spectrum matching by LEDs based on the influence of driving current on peak wavelength
TL;DR: A modified Gaussian formula with an additional variable, driving current I, was used to simulate the LED power spectrum, and was further employed in an optimizing algorithm to achieve solar spectrum matching by 14 types of LEDs with different peak wavelengths.
References
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Journal ArticleDOI
High-power AlGaInN flip-chip light-emitting diodes
Jonathan J. Wierer,Daniel A. Steigerwald,Michael R. Krames,J. O'Shea,M. J. Ludowise,G. Christenson,Y. C. Shen,C. H. Lowery,Paul S. Martin,S. Subramanya,W. Götz,Nathan F. Gardner,R. S. Kern,S. A. Stockman +13 more
TL;DR: In this article, the authors presented a flip-chip light-emitting diodes (FCLEDs) with a large emitting area (∼0.70 mm2) and an optimized contacting scheme allowing high current (200-1000 mA, J∼30-143 A/cm2) operation with low forward voltages.
Journal ArticleDOI
Thermal analysis and optimization of multiple LED packaging based on a general analytical solution
TL;DR: In this paper, a general analytical solution is used to study the whole temperature field of LED packaging substrate, this solution is based on the method of variable separation for thermal spreading resistances of eccentric heat sources on a rectangular flux channel.
Proceedings ArticleDOI
A noncontact method for determining junction temperature of phosphor-converted white LEDs
Yimin Gu,Nadarajah Narendran +1 more
TL;DR: In this paper, a noncontact method for determining the junction temperature of phosphor-converted white LEDs was developed. But the method only considered the 5mm epoxy encapsulated GaN+YAG Cerium phosphor white LED.
Journal ArticleDOI
Electrical, optical and thermal degradation of high power GaN/InGaN light-emitting diodes
TL;DR: In this paper, the degradation of high power GaN/InGaN blue light-emitting diodes (LEDs) was investigated by considering the electrical, optical and thermal ageing characteristics.