Enhanced Luminescence and Photomagnetic Properties of Surface-Modified EuO Nanocrystals This work was supported partly by NEDO (New Energy Industrial Technology Development Organization) and Grant-in-Aid for Scientific Research No.13740397 from the ministry of Education, Science, Sports and Culture. We are grateful to Mr. S. Watase and Dr. M. Nakamoto of the Osaka City Research Center for their services in elemental analyses and ICP-AES, and Mr. Y. Yamamoto of the Institute of Scientific and Industrial Research at Osaka University for magnetic measurements. We also thank Emeritus A. Yanase at Osaka Prefecture University for helpful discussion on the magnetization of EuO, and Prof. N. Nakashima at Osaka city university for helpful discussion on the photochemical reduction of EuIII.

Abstract

Photoinduced enhancement of magnetization is exhibited by polyurea-modified EuO nanocrystals, prepared by photolysis of europium(III) nitrate and urea in methanol (see scheme). The nanoparticles, which have an average diameter of 3.4 nm and a narrow size distribution, also exhibit a remarkably high emission quantum yield.