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Energy Transfer Under Electrical Excitation and Enhanced Electroluminescence in the Nanolaminate Yb,Er Co‐Doped Al 2 O 3 Films
Author(s) -
Yang Yang,
Ouyang Zhongtao,
Liu Jianzhao,
Sun Jiaming
Publication year - 2019
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201900137
Subject(s) - electroluminescence , materials science , doping , excitation , excited state , ion , optoelectronics , atomic layer deposition , quantum efficiency , light emitting diode , atomic physics , thin film , analytical chemistry (journal) , nanotechnology , layer (electronics) , chemistry , physics , engineering , organic chemistry , chromatography , electrical engineering
The energy transfer from Yb 3+ to Er 3+ ions under electrical excitation which enhances the Er‐related 1531 nm electroluminescence is evidenced, within the nanolaminate Yb,Er co‐doped Al 2 O 3 films fabricated by atomic layer deposition. The light‐emitting devices based on these nanolaminates present an external quantum efficiency up to 24% and the power efficiency of 2.8×10 −3 , ≈60% higher than the solely Er‐doped Al 2 O 3 device. The decay dynamics also support, with the radiative lifetime of the Yb 3+ emission reduced while that of Er 3+ emission rises. The Er 3+ and Yb 3+ ions are impact‐excited by hot electrons, which stem from Poole–Frenkel conduction mechanism in Al 2 O 3 matrix. This work certifies the potential of sensitizing Er 3+ ions by the adjacent Yb 3+ ions under electrical excitation, and applications of the rare earth‐doped nanolaminates in silicon‐based optoelectronics.