Synthesis of nano-sized YAG:Eu phosphor in continuous supercritical water system |
| |
Authors: | Jung-Hyun In Hyeon-Cheol Lee Min-Jae Yoon Kyo-Kwang Lee Jae-Wook Lee Chang-Ha Lee |
| |
Affiliation: | aDepartment of Chemical Engineering, Yonsei University, Seoul 120-749, Republic of Korea |
| |
Abstract: | Luminescent yttrium aluminum garnet (Y3Al5O12) nanoparticles doped with Eu (YAG:Eu3+) were continuously synthesized by directly feeding potassium hydroxide solution and metal salt solution to supercritical water (SCW). Effects of Eu concentration, pH, and residence time on photo-luminescence were studied using a continuous tubular reactor. Residence time played a key role in producing single-phase YAG:Eu3+ nanoparticles. The residence time of 20 s under SCW conditions (400 °C and 280 bar) was enough to form YAG:Eu3+ phosphor without any intermediate phases. At this residence time, the Eu concentration and pH condition under SCW contributed to improving the size, morphology and luminescent property of YAG: Eu3+ nanoparticles. The average size of the prepared phosphor nanoparticles at 10 at.% and pH of 9.10 was 74 nm and the morphology was identified as nearly uniform and spherical-like in shape. Without further thermal treatment, the phosphor YAG:Eu3+ synthesized in the continuous reactor under SCW conditions showed strong luminescence properties and red emission spectra. |
| |
Keywords: | Supercritical water Y3Al5O12(YAG) Luminescent properties Nanoparticle |
本文献已被 ScienceDirect 等数据库收录! |