Open AccessColor-tunable electroluminescence from Eu-doped TiO_2/p^+-Si heterostructured devices: engineering of energy transfer
Author(s) -
Chen Zhu,
Chunyan Lv,
Canxing Wang,
Yiping Sha,
Dongsheng Li,
Xiangyang Ma,
Deren Yang
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.002819
Subject(s) - materials science , electroluminescence , annealing (glass) , doping , silicon , optoelectronics , oxygen , semiconductor , nanotechnology , chemistry , metallurgy , organic chemistry , layer (electronics)
We report on color-tunable electroluminescence (EL) from TiO(2):Eu/p(+)-Si heterostructured devices using different TiO(2):Eu films in terms of Eu content and annealing temperature. It is found that the Eu-related emissions are activated by the energy transferred from TiO(2) host via oxygen vacancies, at the price of weakened oxygen-vacancy-related emissions. Both the higher Eu content and the higher annealing temperature for TiO(2):Eu films facilitate the aforementioned energy transfer. In this context, the dominant EL from the TiO(2):Eu/p(+)-Si heterostructured devices can be transformed from oxygen-vacancy-related emissions into Eu-related emissions with increasing Eu-content and annealing temperature for TiO(2):Eu films, exhibiting different colors of emanated light. We believe that this work sheds light on developing silicon-based red emitters using the Eu-doped oxide semiconductor films.