Lu C.-H.Hong H.-C.Jagannathan R.2019-05-132019-05-13200209599428https://scholars.lib.ntu.edu.tw/handle/123456789/407470Luminescent Y3Al5O12:Ce3+ (YAG:Ce3+) ceramics with nanometer- to micronmeter-sized particles were prepared by a new sol-gel pyrolysis method. Notwithstanding thermochemical considerations, the combined fuel system of urea and poly(vinyl alcohol) (PVA) yielded nanoparticles exhibiting single-crystal features. This can be attributed to the pyrolysis of sols trapped within the cages formed by the cross-linking of PVA chains in the presence of urea. Another salient feature of this investigation is the higher luminescence yield for YAG:Ce3+ samples prepared using only urea as the fuel at much lower temperature (1000¢XC) compared to YAG: Ce3+ samples prepared by the conventional solid-state reaction method at 1450¢XC. In addition, the partial aliovalent substitution of Y3+ by Ba2+ in this important luminescent ceramic results in new defect complexes serving as precursors for the generation of excitons. Under band-edge photoexcitation, the excitons thus generated can resonate with excited levels of Ce3+ which have a profound dependence on the particle size.journal article10.1039/b200776m2-s2.0-0036686564https://www.scopus.com/inward/record.uri?eid=2-s2.0-0036686564&doi=10.1039%2fb200776m&partnerID=40&md5=1250ed246303e6b024ef927804a2d357