Abstract
An effective emission model of phosphor film is proposed
by using bidirectional scattering distribution function system (BSDF), and
the model is verified by white light-emitting diodes (LEDs) with conformal
and remote phosphor structure. The emission model is built to clarify the
optical characteristics by analyzing the angular-dependent distribution of
emission and excitation behaviors in phosphor film. The white LEDs with conformal
and remote phosphor structure are also fabricated for experimental comparison.
The uniformity of angular correlated color temperature (CCT) in white LEDs
can be determined by the angular distribution of blue and yellow light, which
is in turns decided by the refractive index variation between chip a©nd
phosphor layers. Finally, the experimental results are found to have good
agreement with the simulation results performing by the Monte Carlo method.
© 2013 IEEE
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