A novel 5d-7f transition phosphor KAl1–xPO4Cl:Tbx3+ (0.1 ≤ x ≤ 1.0) Ashish Akojwar, Dipak Nagapure, Purushottam Naktode, Kartik Shinde and Namdeo Kokode Eur. Phys. J. Appl. Phys., 97 (2022) 5 Published online: 24 January 2022 DOI: 10.1051/epjap/2021210199