Abstract
Optical thermometry as an important local temperature-sensing technique,has received increasing atten-tion in scientific and industrial areas.However,it is still a big challenge to develop luminescent materi-als with self-activated dual-wavelength emissions toward high-sensitivity optical thermometers.Herein,a novel ratiometric thermometric strategy of Bi3+-activated dual-wavelength emission band was real-ized in the same lattice position with two local electronic states of La3Sb1-xTaxO7:Bi3+(0≤x≤ 1.0)ma-terials based on the different temperature-dependent emission behaviors,benefiting from the highly-sensitive and regulable emission to the coordination environment of Bi3+.The structural and spectral results demonstrate that the emission tremendously shifted from green to blue with 68 nm and the in-tensity was enhanced 2.6 times.Especially,the visual dual-wavelength emitting from two emission cen-ters was presented by increasing the Ta5+substitution concentration to 20％or 25％,mainly originating from the two local electronic states around the Bi3+emission center.Significantly,the dual-wavelength with different thermal-quenching performance provided high-temperature sensitivity and good discrim-ination signals for optical thermometry in the range between 303 and 493 K.The maximum rela-tive sensitivity reached 2.64％/K(La3Sb0.8Ta0.2O7:0.04Bi3+@383 K)and 1.91％/K(La3Sb0.75Ta0.25O7:0.04Bi3+@388 K).This work reveals a rational design strategy of different local electronic states around the single-doping multiple emission centers towards practical applications,such as luminescence thermometry and white LED lighting.
基金项目
国家自然科学基金(52072101)
国家自然科学基金(51972088)
国家自然科学基金(52172205)
Fundamental Research Funds for the Provincial Universities of Zhejiang(GK229909299001-003)
Postgraduate Research Innovation Fund of Hangzhou Dianzi University(CXJJ2022032)
NETL
NSTL
万方数据