Whatever words you choose to use, THANK YOU is what you’re really trying to say to your employee. Writing a letter or email thanking them and showing your appreciation for work they have done that is above and beyond the daily expectations of their job role, is a nice gesture, and would be much appreciated by the recipient.
The following letters can be adapted to the specific circumstances.
Sample letter of congratulation for a job well done
Sample letter of congratulations for increased sales
Sample congratulations on an outstanding achievement
Sample complimentary letter on handling of emergency
Sample letter to compliment an employee
Sample letter of thanks for working overtime