The innovation engine for new materials

Estella Liu

Estella Liu, Chemical Engineering, University of California Santa Barbara


Chemical Engineering


University of California, Santa Barbara


Jason Grebenkemper

Faculty Sponsor(s): 

Kristin Denault
Fluency Lighting Technologies Inc

Faculty Sponsor's Department(s): 

Materials Research Laboratory

Project Title: 

High Intensity and Low Etendue Lighting with Phosphor Converted Laser Diodes

Project Description: 

Low etendue laser-based light sources, characterized by narrow beam angles and small areas, are more efficient and cost-effective alternatives to energy consuming and high maintenance halogen and xenon bulbs currently used in specialty lighting markets, such as movie projectors, spotlights, and museum lighting. Fluency Lighting Technologies is developing a compact phosphor converted laser diode design that produces bright, long lasting, and low etendue white light which cannot be achieved with diffuse light emitting diodes (LEDs). In previous experiments, we have optimized the composition and encapsulation method for the phosphor powder, and our phosphor-laser design has reached target power densities. To produce brighter and narrower angle white light, we are currently characterizing and investigating the angular distribution of light output through different optics. Using a goniometer for precise angular measurements and a spectrometer to determine power output and color properties, we can calculate the angular power distribution for the blue laser diode, the phosphor chip, and other diverse optics. For total light characterization, an integrating sphere is used to determine light output, efficiency, and color quality. Preliminary angular power and color quality results suggest that light emitted from the phosphor chip is evenly distributed, and the light color is consistent throughout the beam. After completing the angular distribution measurements, we plan to incorporate different optical devices into Fluency’s phosphor-laser design to optimize beam transmission, increase homogeneity, and tune beam angle.