“…We should also mention here recent investigations on alkali and alkaline earth borate phases (e.g. of compositions NaSr 4 (BO 3 ) 3 , Ba 3 Y 2 (BO 3 ) 4 , NaCaBO 3 ) doped with Ce 3 þ , Tb 3 þ and Mn 2 þ , the latter of which displayed efficiencies of the green emission of 36% under 347 nm excitation [14][15][16]. Due to the still moderate quantum yields and higher energy excitation maxima given for NaCaBO 3 , as well as of the undiluted CeBO 3 :Tb, we decided to focus on borate compositions comprising Y 3 þ , Ce 3 þ and Tb 3 þ .…”