摘要
采用溶剂热法合成了一系列Cs_(2)NaBiCl_(6)∶Mn^(2+)与Cs_(2)Na_(1-x)K_(x)BiCl_(6)∶Mn^(2+)荧光粉,并通过理论计算与实验表征相结合的方式系统研究了其晶体结构和发光性能。结果表明,Cs_(2)NaBiCl_(6)∶Mn^(2+)体系表现出以[BiCl_(6)]^(3-)八面体为中心的局域激发吸收近紫外光,随着Mn^(2+)掺杂浓度的增加,[BiCl_(6)]^(3-)向Mn^(2+)发生能量转移,从而促进了Mn^(2+)的d轨道之间的电子跃迁并产生橙黄色发光。进一步引入K^(+)后,Cs_(2)NaBiCl_(6)∶Mn^(2+)发光强度和颜色纯度得到提升。实验证实K^(+)的引入有效调谐了Cs_(2)NaBiCl_(6)∶Mn^(2+)的态密度组成,促进了[BiCl_(6)]^(3-)的^(1)S_(0)→^(3)P_(1,2)电子跃迁,增强了Cs_(2)NaBiCl_(6)∶Mn^(2+)的发光强度,并利用CIE软件计算得到其色纯度为93.58%。最终结果表明,Cs_(2)Na_(1-x)K_(x)BiCl_(6)∶Mn^(2+)具有较强的橙黄色发光特性。
A series of Cs_(2)NaBiCl_(6)∶Mn^(2+)and Cs_(2)Na_(1-x)K_(x)BiCl6∶Mn^(2+)phosphors were synthesized using a solvothermal method.Crystal structures and optical properties were systematically studied through theoretical calculations and experimental measurements.The results showed that in the Cs_(2)NaBiCl_(6)∶Mn^(2+)system,localized excitation absorption near ultraviolet light centered on the[BiCl_(6)]^(3-)octahedron was observed.With the increase of Mn^(2+)doping concentration,energy transfer from[BiCl_(6)]^(3-)to Mn^(2+)promoted electronic transitions between the d orbitals of Mn^(2+)and produced orange-yellow luminescence.After further introducing K^(+),the photoluminescence(PL)intensity and color purity of Cs_(2)NaBiCl_(6)∶Mn^(2+)were enhanced.It was confirmed that the introduction of K^(+)effectively tuned the density of states composition of Cs_(2)NaBiCl_(6)∶Mn^(2+)and promoted the ^(1)S_(0)→^(3)P_(1,2) electron transition of[BiCl_(6)]^(3-),thus enhancing the PL intensity of Cs_(2)NaBiCl_(6)∶Mn^(2+),and the color purity was calculated to be 93.58% using CIE software.The final results suggested that Cs_(2)Na_(1-x)K_(x)BiCl6∶Mn^(2+)had strong orange-yellow luminescent properties.
作者
于麒麟
徐怡菲
张彭军
郝树伟
朱崇强
杨春晖
YU Qilin;XU Yifei;ZHANG Pengjun;HAO Shuwei;ZHU Chongqiang;YANG Chunhui(School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《无机化学学报》
北大核心
2025年第6期1058-1067,共10页
Chinese Journal of Inorganic Chemistry
基金
国家自然科学基金(No.52072086)资助。
