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Troy, N.Y. -  4/2/2015

LRC Doctoral Student's Paper Most Popular SPIE Digital Library Download

A published paper by Lighting Research Center doctoral student Indika U. Perera was ranked as a top SPIE Digital Library download for the month of February 2015 ( The paper, “Mathematical model to analyze phosphor layer heat transfer of an LED system,” was one of two top downloads for the month under the category of light sources and illumination.

The paper focuses on determining the temperature distribution based on light propagation in the phosphor layer of a light-emitting diode (LED) system. With the quantity of luminous flux now increasing from phosphor-converted white LEDs, the heat generation within the phosphor layer has become an issue for reliable performance. The predicted temperature distribution using Perera’s mathematical model showed good agreement with experimentally measured temperature values. The model can be used to predict the temperature distribution in an LED phosphor layer under different heat transfer conditions to provide insight that is difficult to observe in experimental studies.

The paper was presented at the Thirteenth International Conference on Solid State Lighting, held in San Diego, CA, in August 2014, and published in the conference’s SPIE proceedings, volume 9190 (

This is the second paper that Perera has published on this topic, which is the basis for his dissertation work. The first paper was presented at ITHERM 2014: The 14th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems, held in Lake Buena Vista, FL, in May 2014, and published in the conference’s IEEE proceedings.

Perera holds a bachelor’s degree in mechanical engineering from the University of Moratuwa, Sri Lanka, a master’s degree in mechanical engineering from Purdue University, and a master’s degree in lighting from Rensselaer. He is expected to graduate with a doctoral degree in architectural sciences with a concentration in lighting in December 2015.

About the Lighting Research Center
The Lighting Research Center (LRC) at Rensselaer Polytechnic Institute is the world's leading center for lighting research and education. Established in 1988 by the New York State Energy Research and Development Authority (NYSERDA), the LRC conducts research in solid-state lighting, light and health, transportation lighting and safety, energy efficiency, and plant pathology. LRC lighting scientists with multidisciplinary expertise in research, technology, design, and human factors, collaborate with a global network of leading manufacturers and government agencies, developing innovative lighting solutions for projects that range from the Boeing 787 Dreamliner to U.S. Navy submarines to hospital neonatal intensive-care units. In 1990, the LRC became the first university research center to offer graduate degrees in lighting and today, offers a M.S. in lighting and a Ph.D. to educate future leaders in lighting. With 35 full-time faculty and staff, 15 graduate students, and a 30,000 sq. ft. laboratory space, the LRC is the largest university-based lighting research and education organization in the world.

About Rensselaer Polytechnic Institute
Rensselaer Polytechnic Institute, founded in 1824, is America's first technological research university. The university offers bachelor's, master's, and doctoral degrees in engineering; the sciences; information technology and web sciences; architecture; management; and the arts, humanities, and social sciences. Rensselaer faculty advance research in a wide range of fields, with an emphasis on biotechnology, nanotechnology, computational science and engineering, data science, and the media arts and technology. The Institute has an established record of success in the transfer of technology from the laboratory to the marketplace, fulfilling its founding mission of applying science "to the common purposes of life."