SYSTHESIS AND OPTICAL PROPERTIES OF RARE EARTHS DOPED NANO-SEMICONDUCTORS AND THEIR APPLICATIONS

Autor:	Shuji Komuro, Susumu Harako, Xinwei Zhao, Shinri Noguchi
Rok vydání:	2002
Předmět:	Photoluminescence Materials science business.industry Band gap Doping Analytical chemistry Statistical and Nonlinear Physics Condensed Matter Physics Nanocrystalline material Ion Semiconductor Earth (chemistry) Thin film business
Zdroj:	International Journal of Modern Physics B. 16:4294-4301
ISSN:	1793-6578 0217-9792
DOI:	10.1142/s0217979202015297
Popis:	Er and Yb have been doped into nanocrystalline Si and ZnO thin films. Sharp and intense photoluminescence (PL) lines related to intra-4f transitions in the rare earth ions were observed. The optical transition dynamics of the rare earth ions were investigated by time-resolved PL measurements. It was demonstrated that a nano-meter sizing of Si widened the energy bandgap and led to an increase of doping densities of the rare earths. It was also shown that the Er-related PL gave rise to different features under direct and indirect excitations indicating a strong interaction of electron-hole pairs in the host with 4f electrons in the rare earth ions. A co-doping effect of Yb and Er into nanocrystalline Si was presented also. Our results suggested a rare earth-rare earth coupling between the Yb 3+ ions and the Er 3+ ions, which transferred the energy from Yb to Er and enhanced the 1.54 μm PL of Er.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::19e520dc6b17323bba3c64de4a08084c https://doi.org/10.1142/s0217979202015297 Zobrazit plný text záznamu