Lighting is a crucial technology that is used every day. Theintroduction of the white light emitting diode (LED) that consists ofthe Nobel Prize-winning technology of a blue LED combined with aphosphor layer, dramatically reduces the energy consumption forlighting. Despite the fast-growing market penetration, there arecurrently only trial and error approaches for white LED modeling. Inthis thesis, I define experimental and theoretical tools thatanalytically connect phosphor powder properties to the color point of awhite LED. Phosphor particles inside the diffuser layer scatter, absorband re-emit incident light. Absorption and scattering comparably affectlight; hence, neither of the effects can be neglected. Due to theseproperties, widely used analytical tools fail to describe phosphordiffusion layers. In this thesis it was propose and experimentallyverified a novel systematic approach that fully describes lightdiffusion and re-emission in phosphor layers.

M. L. Meretska

2018

02/2018

Thesis advisors: W. L. Vos, A. Lagendijk, and W. L. IJzerman

University of Twente

absorption, Diffusion of light, scattering, white LEDs