Simultaneous synthesis and densification of transparent, photoluminescent polycrystalline YAG by current activated pressure assisted densification (CAPAD)
作者： E.H. Penilla , Y. Kodera , J.E. Garay
DOI: 10.1016/J.MSEB.2012.05.026
关键词:
摘要: Abstract We report a method for the synthesis and processing of transparent bulk polycrystalline yttrium aluminum garnet (YAG) photoluminescent Ce-doped YAG ceramics via solid-state reactive-current activated pressure assisted densification (CAPAD). The process uses commercially available γ-Al 2 O 3 , Y CeO nanopowders. nanopowders were reacted densified simultaneously at temperatures between 850 °C 1550 °C maximum 105 MPa. reaction to phase pure occurs in under 4 min 1100 °C which is significantly faster (on order tens hours) much lower (∼600 °C) compared conventional sintering. found that improves – shrinkage rate reaction-produced was three times higher than using pre-reacted powder. Ce additions retard driven kinetics by factor ∼3, but are still (by ∼1.6) those associated with direct (no synthesis). Densities >99% achieved both doped (Ce:YAG). Results optical measurements show good transparency visible photoluminescence (PL) Ce:YAG. PL peak broad appears white when excited blue light confirming can be used solid state lighting produce light.
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