Chen Daqin, Chen Xiao, Li Xiaoyue, Guo Hai, Liu Shen, Li Xinyue
Opt Lett. 2017 Dec 1;42(23):4950-4953. doi: 10.1364/OL.42.004950.
Cr-doped BiGaO-BiAlO solid-solution (SS) phosphors were fabricated to explore their possible application in fluorescence lifetime-based temperature sensing. The present samples exhibited E2→A4 R-line emissions associated with T4→A4 phonon sideband emissions of Cr in the wavelength range of 600-850 nm upon the excitation of visible light. Through modifying the Al/Ga ratio in the SS hosts, the Cr crystal field was easily tuned from intermediate to strong, being beneficial to modulate an energy gap between E2 and T4 thermally coupled emitting states. As a result, linearly temperature-sensitive fluorescence lifetime was achieved in the Cr-doped BiGaO-BiAlO SSs with a high Al/Ga ratio, enabling us to conveniently and accurately determine a temperature with a high relative sensitivity of 2.13-3.26% K.
制备了Cr掺杂的BiGaO-BiAlO固溶体（SS）荧光粉，以探索其在基于荧光寿命的温度传感中的潜在应用。当前样品在可见光激发下，在600-850 nm波长范围内表现出与Cr的T4→A4声子边带发射相关的E2→A4 R线发射。通过改变SS主体中的Al/Ga比，Cr晶体场很容易从中等强度调节到强强度，这有利于调节E2和T4热耦合发射态之间的能隙。结果，在具有高Al/Ga比的Cr掺杂BiGaO-BiAlO SS中实现了线性温度敏感的荧光寿命，使我们能够方便、准确地测定温度，相对灵敏度高达2.13-3.26% K。
