Effects of light scattering in optical coatings on energy losses in LED devices

The effect of light scattering in phosphor-containing optical coatings on energy losses in chip-on-board LED devices is considered. The energy losses have been evaluated by numerical simulation with the refractive index of the coating material ( n = 1.4–1.8) and the average radius of dispersed phosp...

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Bibliographic Details
Published in:Technical physics letters 2013-12, Vol.39 (12), p.1074-1077
Main Authors: Lipnitskaya, S. N., Mynbaev, K. D., Bugrov, V. E., Kovsh, A. R., Odnoblyudov, M. A., Romanov, A. E.
Format: Article
Language:English
Subjects:
Classical and Continuum Physics
Physics
Physics and Astronomy
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Summary:The effect of light scattering in phosphor-containing optical coatings on energy losses in chip-on-board LED devices is considered. The energy losses have been evaluated by numerical simulation with the refractive index of the coating material ( n = 1.4–1.8) and the average radius of dispersed phosphor particles ( R = 5–50 μm) being the variable parameters. It is established that the energy losses most significantly depend on the level of total internal reflection at the coating/air interface. In the LED device configuration studied, the optimum refractive index of the coating material is n = 1.4. It is also found that, in order to reduce the energy losses related to light scattering on phosphor particles, it is expedient to use phosphors with coarse particles ( R = 50 μm).
ISSN:1063-7850
1090-6533
DOI:10.1134/S1063785013120213