Hi,
Here is the format for Experience Letter. This is simple and clear; I think this will be acceptable.
TO WHOM IT MAY CONCERN
This is to certify that
Mr./Mrs. [Employee Name], S/o [Father's Name], had worked in our organization as [designation] in [division] for [duration] years/months.
During their tenure, we found their character to be satisfactory.
We wish them all success in their future.
Date:
Place:
Authorized Signatory
For [Organization Name]
Thank you and best regards,
Thamburajan
MBA, PGDBM, MSc. Psy.