MGa2B2O7:Bi3+,Al3+ (M = Sr, Ba) blue phosphors with a quantum yield of 99% and negative thermal quenching

By optimizing the Debye temperature, we identified two extremely efficient phosphors based on the S-P transition of Bi3+. The quantum yields of Sr0.99Ga1.50B2O7:0.01Bi(3+),0.50Al(3+) and Ba0.995Ga1.60B2O7:0.005Bi(3+),0.40Al(3+) phosphors reach 96% and 99%, respectively. Moreover, Sr0.99Ga1.50B2O7:0.01Bi(3+),0.50Al(3+) exhibits negative thermal quenching, which shows unique advantages for practical application. The blue phosphors with quantum efficiencies close to unity and superior thermal stability can be competitive candidates for practical applications.

Automated summary

By optimizing the Debye temperature, two highly efficient phosphors based on S-P transition of Bi3+ were identified, with quantum yields reaching 96% and 99%. One of them exhibited negative thermal quenching. These blue phosphors with near-perfect quantum efficiencies and superior thermal stability can be competitive candidates for practical applications.