Residual porosity and optical properties of spark plasma sintered transparent polycrystalline cerium-doped YAG. Issue 4 (April 2019)

• Record Type: Journal Article
• Authors: Wagner, Avital; Ratzker, Barak; Kalabukhov, Sergey; Sokol, Maxim; Frage, Nachum
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 4(2019)
• Page Start: 1436
• Page End: 1442
• Publication Date: 2019-04
• Subjects: Ce:YAG ceramic -- Spark plasma sintering -- Residual porosity -- Transparency -- Photoluminescence; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.11.006
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Transparent cerium-doped yttrium aluminum garnet (Ce:YAG) phosphors are promising candidates for high-power white light emitting diode applications. In the present study, Ce:YAG powder was synthesized by a co-precipitation method and highly transparent ceramics were fabricated by spark plasma sintering. The effects of temperature and pressure, as well as post-sintering treatments (annealing or hot isostatic pressing), on residual porosity were studied by electron and confocal laser microscopy. Correlation between residual porosity characteristics (pore size and volume fraction) and optical properties (in-line transmittance and photoluminescence intensity) of the luminescent transparent ceramics was established.