Several commercial luminescent marker products are available. Off-the-shelf solutions (such as those from Luminlay) are available in several sizes or raw sheet, costing upward of USD$20-30 plus shipping for enough to do a full instrument. A more temporary solution exists in the form of pre-made stickers that fit over existing inlays or sheets of adhesive-backed vinyl that can be cut to whatever shape you please.
For relatively little expense, it is laughably easy to make several sets of your own high intensity luminescent inlays, even making sizes and shapes not commercially available