Phosphor material dependent spot size limitations in laser lighting

Abstract

 Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

High‐Performance Phosphor‐in‐Glass Film on Thermoelectric Generator for Non‐Radiative Energy Recycling in Laser Lighting

“…The cold‐side ceramic has a uniform temperature distribution, while the hot‐side ceramic has a hotspot in the laser spot area owing to the Gaussian intensity distribution of blue LD. [ 46 ]…”

Breakdown of light transport models in photonic scattering slabs with strong absorption and anisotropy

“…7 and 8, we see that the P 3 + δE (4) approximation would be the best one to use for both cases since it has less than 1% error for extracting tr and abs , whereas the P 3 approximation has P 3 tr = 7% for absorbing, and P 3 tr = 10% for nonabsorbing wavelengths. Earlier on, Jacques et al have experimentally and numerically investigated light distribution in various phosphor plates [60]. The optical constants of a slab containing composite ceramic Ce:YAG are reported as: a = 0.71, g = 0.75 at a wavelength λ = 450 nm where the phosphors are absorbing [60].…”

“…Earlier on, Jacques et al have experimentally and numerically investigated light distribution in various phosphor plates [60]. The optical constants of a slab containing composite ceramic Ce:YAG are reported as: a = 0.71, g = 0.75 at a wavelength λ = 450 nm where the phosphors are absorbing [60]. Assuming the index contrast n 2 = 0.245, and the optical thickness b = 3, Figs.…”

“…. A more absorbing slab containing Ce:LuAG and Eu:nitride has reported optical constants a = 0.25 and g = 0.75 at a wavelength λ = 450 nm[60]. With n 2 = 0.245 and b = 3, Figs.7 and 8show that the P 3 + δE (4) approximation yields tr and abs with less than 1% relative error, whereas with the P 1 approximation haveP 1 tr = 62.26% and P 1 abs = 38.89%, and the P 3 approximation have P 3 tr = 40.13% and P 3…”

Thermally robust Al2O3–La3Si6N11:Ce3+ composite phosphor-in-glass (PiG) films for high-power and high-brightness laser-driven lighting

“…White light-emitting diodes (LEDs) are widely used in the display and lighting fields due to their advantages of energysaving, high brightness, environmental-friendliness and compactness. 1,2 However, the ''efficiency droop'' problem of blue LED chips leads to a low luminous flux per unit area, thus greatly limiting their applications in high-power and highbrightness solid-state lighting, such as vehicle headlight and airport lighting. 3,4 On the other hand, blue laser diodes (LDs) do not have such a problem, and their output power increases linearly with the input power, which allows production of highbrightness white light upon combining them with robust phosphors (or color converters).…”