Manipulation of Molecular Vibrations on Condensing Er3+ State Densities for 1.5 μm Application

Huanqing Ye; Jelena Gorbaciova; Chen Lyu; Claire Burgess; Alex S Walton; Khadisha M Zahra; Richard J Curry; Rex H S Bannerman; James C Gates; Peter B Wyatt; William P Gillin

doi:10.1021/acs.jpclett.1c02691

Manipulation of Molecular Vibrations on Condensing Er³⁺ State Densities for 1.5 μm Application

J Phys Chem Lett. 2021 Oct 7;12(39):9620-9625. doi: 10.1021/acs.jpclett.1c02691. Epub 2021 Sep 29.

Authors

Huanqing Ye¹, Jelena Gorbaciova^{1

2}, Chen Lyu², Claire Burgess¹, Alex S Walton³, Khadisha M Zahra³, Richard J Curry⁴, Rex H S Bannerman⁵, James C Gates⁵, Peter B Wyatt⁶, William P Gillin^{1

2}

Affiliations

¹ Chromosol Ltd., The Walbrook Building, 25 Walbrook, London, EC4N 8A, U.K.
² Materials Research Institute and Department of Physics and Astronomy, Queen Mary University of London, Mile End Road, London, E1 4NS, U.K.
³ Photon Science Institute and Department of Chemistry, FSE Research Institutes, The University of Manchester, Manchester, M13 9PL, U.K.
⁴ Photon Science Institute, Department of Electrical and Electronic Engineering, University of Manchester, Manchester M13 9PL, U.K.
⁵ Zepler Institute, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, U.K.
⁶ Materials Research Institute and Department of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.

PMID: 34585923
DOI: 10.1021/acs.jpclett.1c02691

Abstract

Vibrational modes of chemical bonds in organic erbium (Er³⁺) materials play an important role in determining the efficiency of the 1.5 μm Er³⁺ emission. This work studies the energy coupling of the Er³⁺ intra-4f transitions and vibrational modes. The results demonstrate that the coupling introduces enormous nonradiative internal relaxation, which condenses the excited erbium population on to the ⁴I_13/2 state. This suggests that vibrational modes can be advantageous for optimizing the branching ratio for the 1.5 μm transition in organic erbium materials. Through control of the quenching effect on to the ⁴I_13/2 state and a reliable determination of intrinsic radiative rates, it is found that the pump power for population inversion can be reduced by an order of magnitude at high erbium concentrations compared to conventional inorganic erbium materials.