Ho-June Byun et al 2009 Nanotechnology 20 495602 doi:10.1088/0957-4484/20/49/495602
Ho-June Byun, Jong-Uk Kim and Heesun Yang
Show affiliationsUndoped, Tb3+- and Eu3+-doped ZnGa2O4 colloidal nanocrystals were synthesized by a nonhydrolytic hot solution chemistry. Undoped nanocrystals exhibited an intrinsic blue emission peaking at 437 nm by self-activated transition. The emissions of Tb3+-and Eu3+-doped ZnGa2O4 nanocrystals consisted of their own characteristic green and red line peaks (5D4–7Fj transitions), respectively. Synthetic parameters such as activator concentration and reaction time were varied to investigate their effects on luminescent properties. Tb3+-doped colloidal nanocrystals synthesized for a short reaction time showed an unprecedented, exclusively green luminescence with the host blue emission effectively suppressed. On the other hand, the emission of Eu3+-doped ones was weak with the host emission persistently present regardless of reaction time.
78.67.Bf Nanocrystals and nanoparticles
Soft matter, liquids and polymers
Condensed matter: electrical, magnetic and optical
Condensed matter: structural, mechanical & thermal
Issue 49 (9 December 2009)
Received 27 July 2009, in final form 17 October 2009
Published 6 November 2009
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