(MgCoNiCuZn)O高熵荧光粉的制备及其发光性能

Synthesis of(MgCoNiCuZn)O high-entropy phosphors and their luminescence properties

近年来,(MgCoNiCuZn)O高熵氧化物由于具有独特的结构和功能特性而引起极大关注。本研究通过高温固相法合成了等原子比的(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O高熵氧化物荧光粉,进而利用高熵陶瓷所特有的“鸡尾酒”效应设计出非等原子比的(Mg_(0.2)Co_(0.35)Ni_(0.05)Cu_(0.05)Zn_(0.35))O高熵氧化物荧光粉。结果表明:等原子比的(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O高熵荧光粉在高温固相反应后为单相FCC结构,而非等原子比的(Mg_(0.2)Co_(0.35)Ni_(0.05)Cu_(0.05)Zn_(0.35))高熵荧光粉为HCP和FCC双相结构。由于HCP相的出现使得(Mg_(0.2)Co_(0.35)Ni_(0.05)Cu_(0.05)Zn_(0.35))O的发光强度相比于(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O的发光强度提高了约6倍,并且发射光波长发生红移至峰值发光强度为426 nm的波长处,为标准紫色光,表明利用高熵陶瓷所特有的“鸡尾酒”效应可以有效调控高熵氧化物荧光粉的发光强度及色域。

Recently,(MgCoNiCuZn)O high-entropy oxides have attracted great attention due to their unique structural and functional properties.In this study,(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O high-entropy oxide phosphor with equal atomic ratio was synthesized by high-temperature solid-phase method,and then non equal atomic ratio(Mg_(0.2)Co_(0.35)Ni_(0.05)Cu_(0.05)Zn_(0.35))O high-entropy oxide phosphor was designed by using the unique“cocktail”effect of high-entropy ceramics.The results show that the(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O high-entropy phosphor with equal atomic ratio has a single-phase FCC structure after the high-temperature solid-phase reaction,while the(Mg_(0.2)Co_(0.35)Ni_(0.05)Cu_(0.05)Zn_(0.35))O high-entropy phosphor with non equal atomic ratio exhibits a dual-phase structure of HCP and FCC.Due to the existence of HCP phase,the luminescence intensity of the(Mg_(0.2)Co_(0.35)Ni_(0.05)Cu_(0.05)Zn_(0.35))O high-entropy phosphor is about 6 times higher than that of the(Mg_(0.2)Co_(0.2)Ni_(0.2)Cu_(0.2)Zn_(0.2))O high-entropy phosphor,and the wavelength of the emitted light is red-shifted to the peak luminous intensity of 426 nm,which is the standard violet light,indicating that the luminescence intensity and color gamut of high-entropy oxide phosphors can be effectively controlled by using the unique“cocktail”effect in high-entropy ceramics.