Fluorescent lamp containing adhesive frit in phosphor coating

In a fluorescent lamp comprising a sealed glass envelope having electrodes at its ends and containing a coating of phosphor particles on the interior surface of the envelope, the improvement comprising a melted and solidified amorphous borate-phosphate frit disposed throughout said coating of phosphor particles and bonding said phosphor particles to each other and to the glass envelope, the frit having the general composition Ca.sub.1-x+2n Ba.sub.x O.sub.1+2n.mB.sub.2 O.sub.3.nP.sub.2 O.sub.5, wherein x is between about 0.2 to 0.4, n is between about 0.7 to 1.3, and m is between about 1.7 and 2.3.