Why use HB LED chip on silicon substrate?

Why use HB LED chip on silicon substrate? Comparison on Silicon based Material and ceramic Silicon-based CeramicAIN UnitAl2O3 Cavity (μm) Up to 300μm N/A N/A Thickness (μm) 500 380 TSV Structure Etch Laser Drill Laser Drill Metallization Scheme TiW,

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