@article{10902/32913,
year = {2018},
month = {2},
url = {https://hdl.handle.net/10902/32913},
abstract = {Organic erbium complexes have long been of interest due to their potential for using the strong absorption into the organic to sensitise the erbium emission. Despite this interest there is remarkably little quantitative information on how efective the approach is and the discussion of the energy transfer mechanism is generally vague. Here we accurately quantify the sensitisation as a function of excitation pump density and model it using a rate equation approach. As a result, we can calculate the degree of population inversion for the erbium ions as a function of the pump intensity. We demonstrate that even when we increase the erbium concentration in the flms from ~10 to ~80% we fnd a relatively small decrease in the sensitisation which we attribute to the large (>20Å) Förster radius for the sensitisation
process. We show that we can obtain population inversion in our flms at very low pump powers ~600mW/cm². The calculated Förster radius for the organic erbium complexes suggests design rules for energy transfer between antennas and erbium ions in molecular systems and hybrid organic-inorganic nanoparticles.},
organization = {J.X.H., H.Y., H.L. and Y.P.Z. were financially supported by the China Scholarship Council and Queen Mary
University of London (QMUL). S.K. was supported by a Proof of Concept grant funded by QMUL and the EPSRC
through the Silicon Photonics for Future Systems grant EP/L00044X. J.G. was fnancially supported by QMUL.
I.H. acknowledges fnancial support from the EU FP7 (Marie Curie-CIG-Grant 303535). Y.Z. acknowledges
financial support from the Major State Basic Research Development Program (2013CB922101) and NSFC
(21371093). W.P.G. acknowledges fnancial support from EPSRC (EP/L020114/1 and EP/P007767/1) and from
NSFC (61574095).},
publisher = {Nature Publishing Group},
publisher = {Scientific Reports, 2018, 8(1), 3226},
title = {High sensitization efficiency and energy transfer routes for population inversion at low pump intensity in Er organic complexes for IR amplification},
author = {Hu, Jianxu and Karamshuk, S. and Gorbaciova, J. and Ye, Huanqing and Lu, Haizhou and Zhang, Y.P. and Zheng, Y. X. and Liang, X. and Hernández Campo, Ignacio and Wyatt, Peter B. and Gillin, William P.},
}