Preparation and luminescent properties of modified phosphors VTES@Ba3ScB3O9: xEu3+ and its polymer fluorescence films devices

Cation vacancy-boosted BaZnB4O8:xEu3+ phosphors with high quantum yield and thermal stability for pc-WLEDs

“…The critical quenching concentration of Eu 3+ ions is about 50% in the BZBO host, higher than in other borate hosts like Ba 3 ScB 3 O 9 (5%), NaBa 12 B 7 O 11 F 4 (14%), and CsBaB 3 O 6 (1.2%). 44,57,58 The high quenching concentration may be the result of cation vacancies caused by heterovalent ion substitution in the unique layered structure host. With the increase of Eu 3+ ion concentration, the distance between adjacent Eu 3+ ions decreases, the non-radiative transition between luminescent centers increases, and hence leads to a concentration quenching phenomenon.…”

“…6(b), the emission intensity of pc-WLEDs at the normal operating temperature (423 K) can maintain about 82.8% of its value at room temperature, which is greater than most reported red phosphors like NaBa 12 B 7 O 11 F 4 :Eu 3+ (43.2%), Ba 3 ScB 3 O 9 :Eu 3+ (55.8%), and Ca 3 Y 2 B 4 O 12 :Eu 3+ (72.1%). 57,58,68 Moreover, the quenching temperature ( T 0.5 ) is the temperature at which half of the initial emission intensity is reached and is also used to evaluate thermal stability. T 0.5 of BZBO:0.5Eu 3+ exceeds 473 K, further proving good thermal stability.…”