10 September 2011 Modeling the role of phosphor grain packing in compact fluorescent lamps
Author Affiliations +
Proceedings Volume 8129, Novel Optical Systems Design and Optimization XIV; 81290D (2011); doi: 10.1117/12.893416
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States
Compact fluorescent lamps contain mercury gas which generates ultraviolet radiation. A thin powder layer constituted of rare-earth oxides is coated inside the glass tube. The role of this layer is to convert the inside ultraviolet radiation into outside visible radiation. We focus here on a particular powder layer, constituted by phosphor grains. The phosphor layer has to achieve two distinct goals. On the one hand the grains have to absorb the maximum amount of ultraviolet radiation in order to generate visible light, and on the other hand the transmission of visible light has to be maximized in order to optimize the efficiency of the compact fluorescent lamp. Here, we study the influences of grain size, grain shape, density of packing powder, and thickness of the phosphor coating. Such a study is a first step towards a better understanding of the conversion efficiency of ultraviolet radiation into visible radiations, and can eventually, help to improve the production line of compact fluorescent lamps. All the presented simulations were performed with the commercial software LightTools® using a ray tracing method.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
N. Pannier, M. Filoche, M. Plapp, V. Buissette, T. Le Mercier, "Modeling the role of phosphor grain packing in compact fluorescent lamps", Proc. SPIE 8129, Novel Optical Systems Design and Optimization XIV, 81290D (10 September 2011); doi: 10.1117/12.893416; https://doi.org/10.1117/12.893416

Visible radiation


Ultraviolet radiation


Optical spheres




Visible emission in Sm3+ and Tb3+ doped phosphate glass...
Proceedings of SPIE (October 25 2013)
Simple photometer of F103 model a stand alone unit...
Proceedings of SPIE (September 21 1995)
Gamma radiation effects on some optical glasses
Proceedings of SPIE (January 11 1993)
Factors affecting fluorescent backlight operation
Proceedings of SPIE (August 21 1995)
Fabrication of long lasting phosphorescence glass spheres
Proceedings of SPIE (February 09 2009)
Ultra-Bright fluorescent lamp technology
Proceedings of SPIE (August 16 1999)

Back to Top