摘要
(Gd,Lu)_(2)O_(3)∶Eu scintillation ceramics have promising applications in the high-energy X-ray imaging.Eu0.1Gd0.6Lu1.3O3 nano-powders with pure phase were prepared from the precursor calcined at 1050℃for 4 h by the co-precipitation method.Using the synthesized nano-powders as initial material,Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)ceramics were fabri-cated by vacuum pre-sintering at different temperatures for 2 h and hot isostatic pressing(HIP)at 1750℃for 3 h in ar-gon.The influence of pre-sintering temperature on the microstructure,optical and luminescence properties was investi-gated.The Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)ceramics pre-sintered at 1625℃for 2 h combined with HIP post-treatment show the high-est in-line transmittance of 75.2%at 611 nm.The photoluminescence(PL)and X-ray excited luminescence(XEL)spectra of the Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)transparent ceramics demonstrate a strong red emission peak at 611 nm due to the^(5)D_(0)→^(7)F_(2) transition of Eu^(3+).The PL,PLE and XEL intensities of the HIP post-treated Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)ceramics show a trend of first ascending and then descending with the increase of pre-sintering temperature.The thermally stimulated lumines-cence(TSL)curve of the HIP post-treated Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)ceramics presents one high peak at 178 K and two peaks with lower intensities at 253 K and 320 K.The peak at 320 K may be related to oxygen vacancies,and the lumines-cence peak at 178 K is related to defects caused by the valence state changes of Eu^(3+)ions.
(Gd,Lu)_(2)O_(3)∶Eu闪烁陶瓷在高能X射线成像技术应用中具有广阔的应用前景。采用共沉淀法合成的前驱体经过1050℃煅烧4 h后,制备出纯相的Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)纳米粉体。以合成的纳米粉体为原料,采用不同温度下真空预烧(保温2 h)结合热等静压烧结(1750℃×3 h,Ar气氛)制备了Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)陶瓷。研究了预烧结温度对Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)陶瓷微观结构、光学和发光特性的影响。在1625℃下预烧2 h并结合HIP后处理的Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)陶瓷具有最高的直线透过率(75.2%@611 nm)。由于Eu^(3+)的5 D0→7 F2能级跃迁,HIP后处理的Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)陶瓷的PL和XEL光谱均在611 nm处具有最强的红色发射峰,其强度随预烧温度的提高呈现出先上升后下降的趋势。Eu_(0.1)Gd_(0.6)Lu_(1.3)O_(3)陶瓷的热释光(TSL)曲线在178 K处呈现一个强度较高的峰值,在253 K和320 K处呈现两个强度较低的峰值。320 K的峰值可能与氧空位有关。178 K处的发光与Eu^(3+)离子本身价态变化引起的缺陷有关。
出处
《发光学报》
EI
CAS
CSCD
北大核心
2024年第12期1975-1983,共9页
Chinese Journal of Luminescence
基金
中国科学院国际合作项目(121631KYSB20200039)
上海市自然科学基金(22ZR1472100)
中国科学院国际人才计划(2024VEA0005,2024VEA0014)。
