Reduction effect on the optical properties of Sm2+ doped in SrB4O7 and SrB6O10 crystals

Structural defects and luminescence properties of Sm2+ ions doped in BaBPO5 phosphor by X-ray irradiation

“…At low temperatures sharp lines of the 4f 6 → 4f 6 transitions are likely to be observed, while at high temperatures the 4f 5 5d 1 level can be thermally populated and the broad band emission occurs due to the strongly allowed 4f 5 5d 1 → 4f 6 transitions. Jang et al have reported the similar broad emission after heating the X-ray-irradiated SrB 6 O 10 :Sm 3+ [14]. The broad emission bands are overlapped with the Sm 3+ emission bands as the heating temperature increases.…”

“…It is noting that, however, Sm 3+ can also exist in stable in this oxide. Besides the reducing method, X-ray irradiation is an effective method to reduce Sm 3+ ions to Sm 2+ ions [14,15]. Taking into account of the technical reasons, X-ray irradiations have an advantage over the heating sample in a strong H 2 reducing atmosphere; it has been confirmed that the X-ray-irradiated glasses display faster and more efficient hole-burning compared to the H 2 -gas treated samples [15].…”

Influence of Crystallization on the Conversion of Sm3+→Sm2+ in SrO–Bi2O3–K2O–B2O3 Glass‐Ceramics

“…It has been reported that the conversion of Sm 3+ to Sm 2+ is achieved by thermal treatment in air for SrB 4 O 7, while most samarium ions are present as Sm 3+ in SrB 6 O 10 . Liang et al .…”

“…Another well‐known abnormal reduction method is to irradiate Sm 3+ ‐doped samples with high‐energy radiation, such as fs laser, γ‐ray, and X‐ray. It was reported that the reduction in Sm 3+ to Sm 2+ is completed by thermal treatment in air for certain hosts such as SrB 4 O 7 . Various Sm 3+ ‐doped borate glass‐ceramics have been studied.…”

Effect of Red-emitting Sr2.41F2.59B20.03O74.8:Eu0.12,Sm0.048 Phosphor on Color Rendering Index and Luminous Efficacy of White LEDs

“…Sr 2.41 F 2.59 B 20.03 O 74.8 :Eu 0.12 ,Sm 0.048 (SrSm), which is a Eusensitized, red-emitting, and high efficiency phosphor, has been employed widely in both high-pressure and low-pressure discharge lamps due to its excellent thermal and chemical stability [13][14][15][16][17][18]. However, up to now, there have been very few studies that apply SrSm to improve the CRI of WLEDs.…”