Li Mingjun, Yang Zhengwen, Ren Youtao, Ruan Jiufeng, Qiu Jianbei, Song Zhiguo
College of Materials Science and Engineering , Kunming University of Science and Technology , Kunming 650093 , China.
Inorg Chem. 2019 May 20;58(10):6950-6958. doi: 10.1021/acs.inorgchem.9b00526. Epub 2019 May 10.
Reversible modulation of upconversion luminescence induced by the external field stimuli exhibits potential applications in various fields, such as photoswitches, optical sensing, and optical memory devices. Herein, a new MoO:Yb,Er thermochromic phosphor was synthesized via a high-temperature solid-state method, and the reversible color modification of the MoO:Yb,Er phosphor was obtained by alternating the sintering conditions either in a reducing atmosphere or in air. The color of the MoO:Yb,Er phosphor changed from light-yellow to blue under sintering in the reducing atmosphere and returned back after sintering again in air. The influence of reversible thermochromism on the upconversion luminescence of MoO:Yb,Er phosphor was investigated. The MoO:Yb,Er phosphor prepared in air exhibited visible upconversion luminescence, while the MoO:Yb,Er phosphor has no upconversion luminescence after sintering in the reducing atmosphere. This up-conversion luminescence modulation shows excellent reproducibility after several cycles. The thermochromic MoO:Yb,Er phosphor with reversible modulated upconversion luminescence shows great potential for practical applications in optical switches and optoelectronic multifunctional devices.
由外部场刺激引起的上转换发光的可逆调制在诸如光开关、光学传感和光学存储设备等各个领域展现出潜在应用。在此，通过高温固态法合成了一种新型的MoO:Yb,Er热致变色磷光体，并且通过在还原气氛或空气中交替烧结条件，实现了MoO:Yb,Er磷光体的可逆颜色改性。在还原气氛中烧结时，MoO:Yb,Er磷光体的颜色从浅黄色变为蓝色，再次在空气中烧结后又恢复原状。研究了可逆热致变色对MoO:Yb,Er磷光体上转换发光的影响。在空气中制备的MoO:Yb,Er磷光体呈现出可见的上转换发光，而在还原气氛中烧结后的MoO:Yb,Er磷光体则没有上转换发光。这种上转换发光调制在几个循环后显示出优异的可重复性。具有可逆调制上转换发光的热致变色MoO:Yb,Er磷光体在光开关和光电多功能器件的实际应用中显示出巨大潜力。
