TY - JOUR

T1 - Novel BaBi2B2O7:Eu3+/Tb3+/Tm3+ Co-Doping Phosphors and Compositional Deformations in BaBi2B2O7:REE3+ Systems

AU - Дёмина, Софья Владимировна

AU - Шаблинский, Андрей Павлович

AU - Поволоцкий, Алексей Валерьевич

AU - Бубнова, Римма Сергеевна

AU - Филатов, Станислав Константинович

PY - 2026/2/1

Y1 - 2026/2/1

N2 - Abstract: The development of white-light phosphors via Eu3+/Tb3+/Tm3+ co-doping remains challenging due to imbalanced energy transfer and site-selective incorporation. In this work, we investigate the luminescent properties of BaBi1.70 − xEuxTb0.15Tm0.15B2O7 (x = 0.05, 0.10, 0.15) solid solutions synthesized by solid-state reaction. Powder XRD confirms homogeneity of phosphors and a monotonic decrease of unit cell parameters, consistent with Bi3+ → Eu3+ substitution. Based on experimental data, the miscibility limit for the triple-doped system is estimated at x = 0.475, which is higher than that for single-doped BaBi2 − xEuxB2O7 (x = 0.45), indicating an expansion of the isomorphic miscibility range upon co-doping. Under 295 nm excitation, luminescence is dominated by intense red emission from Eu3+ (614 nm), while green (Tb3+) and blue (Tm3+) components are virtually absent. Excitation spectra at 614 nm show no features attributable to Tb3+ or Tm3+, and CIE coordinates remain in the red region (x ≈ 0.647, y ≈ 0.345). Although white emission was not achieved, this study provides some insights into the role of crystallographic site preference and compositional deformations in multi-ion-doped phosphor design which is essential for rational development of efficient UV-convertible white-light materials.

AB - Abstract: The development of white-light phosphors via Eu3+/Tb3+/Tm3+ co-doping remains challenging due to imbalanced energy transfer and site-selective incorporation. In this work, we investigate the luminescent properties of BaBi1.70 − xEuxTb0.15Tm0.15B2O7 (x = 0.05, 0.10, 0.15) solid solutions synthesized by solid-state reaction. Powder XRD confirms homogeneity of phosphors and a monotonic decrease of unit cell parameters, consistent with Bi3+ → Eu3+ substitution. Based on experimental data, the miscibility limit for the triple-doped system is estimated at x = 0.475, which is higher than that for single-doped BaBi2 − xEuxB2O7 (x = 0.45), indicating an expansion of the isomorphic miscibility range upon co-doping. Under 295 nm excitation, luminescence is dominated by intense red emission from Eu3+ (614 nm), while green (Tb3+) and blue (Tm3+) components are virtually absent. Excitation spectra at 614 nm show no features attributable to Tb3+ or Tm3+, and CIE coordinates remain in the red region (x ≈ 0.647, y ≈ 0.345). Although white emission was not achieved, this study provides some insights into the role of crystallographic site preference and compositional deformations in multi-ion-doped phosphor design which is essential for rational development of efficient UV-convertible white-light materials.

KW - barium–bismuth borate

KW - co-doped phosphors

KW - compositional deformations

KW - luminescence

KW - phosphors

UR - https://www.mendeley.com/catalogue/dd848582-e145-3b09-b4b6-3b037fd057d1/

U2 - 10.1134/s1087659625601339

DO - 10.1134/s1087659625601339

M3 - Article

VL - 52

SP - 93

EP - 103

JO - Glass Physics and Chemistry

JF - Glass Physics and Chemistry

SN - 1087-6596

IS - 1

ER -