Sol-gel syntheses of pentaborate β-LaB5O9 and the photoluminescence by doping with Eu3+, Tb3+, Ce3+, Sm3+, and Dy3+

For the first time, β-LaB5O9 was prepared by sol-gel method, and being a good phosphor host adaptable to various activators. β-La1−xEuxB5O9 (0 ≤ x ≤ 0.15), β-La1−yTbyB5O9 (0