Problem calculating SLA doped with Eu

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Kousei
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Problem calculating SLA doped with Eu

#1 Post by Kousei » Mon Oct 31, 2022 6:40 am

Hello Everyone,

I am trying to replicate a paper: First-principles study of the luminescence of Eu2+-doped phosphors by Jia et al.
The transition energies of SLA:Eu2+ were calculated.

The procedure is as follows:
1. structurally relax the matrix
2. create a supercell and determine the stable structure and the total energies of the ground and excited states
3. perform a single point calculation of the ground and excited states using the stable structure to determine the total energies
4. calculate the transition energies from the difference in total energies.

As a result, the transition energy shown in the paper is about 2 eV, whereas my calculation is much larger, about 8 eV. The plotted band diagram also differs significantly from the paper.
How can I interpret the cause of this?

Best regards.
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Kousei
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Newbie
Posts: 10
Joined: Wed Oct 27, 2021 6:19 am

Re: Problem calculating SLA doped with Eu

#2 Post by Kousei » Thu Dec 08, 2022 6:05 am

I have not been able to verify this yet due to lack of time, but I have come to the conclusion that the order of the orbitals may be swapped due to a subspace diagonalization when calculating the excited states.
I will change the algorithm and try to calculate with LDIAG=.FALSE.
I will report the results in this thread.
Thank you very much.

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