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Here we develop and characterize high thermal conductivity/high thermal shockresistant bulk Ce doped Al2O3 and propose it as a new phosphor convertingcapping layer for high-powered/high-brightness solid-state white lighting(SSWL). The bulk, dense Ce:Al2O3 ceramics have a 0.5 at.% Ce:Al concentration(significantly higher than the equilibrium solubility limit), and were producedusing a simultaneous solid-state reactive Current Activated Pressure-AssistedDensification (CAPAD) approach. Ce:Al2O3 exhibits a broadband emission from400-600nm, which encompasses the entire blue and green portions of the visiblespectrum when pumped with ultra-violet (UV) light that is now commerciallyavailable in UV light emitting devices (LED) and laser diodes (LD). Thesebroadband phosphors can be used in the commonly employed scheme of mixing withother UV converting capping layers that emit red light to produce white light.Alternatively, they can be used in a novel composite down converter approachthat ensures improved thermal-mechanical properties of the converting phosphorcapping layer. In this configuration Ce:Al2O3 is used with proven phosphorconversion materials such as Ce:YAG as an active encapsulant or as a cappinglayer to produce SSWL with an improved bandwidth in the blue portion of thevisible spectrum. In order to study the effect of crystallinity on the Ce PLemission, we synthesize Ce:YAG ceramics using high-pressure CAPAD at moderatetemperatures to obtain varying crystallinity (amorphous through fully-crystalline). We investigate the PL characteristics of Ce:Al2O3 and Ce:YAGfrom 295K to 4K, revealing unique crystal field effects from the matrix on theCe-dopants. The unique PL properties in conjunction with the superiorthermal-mechanical properties of Ce:Al2O3 can be used inhigh-powered/high-brightness integrated devices based on high-efficiency UV-LDthat do not suffer

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Bulk Polycrystalline Ceria Doped Al$_2$O$_3$ and YAG Ceramics for  High-Power Density Laser-Driven Solid-State White Lighting: Effects of  Crystallinity and Extreme Temperatures