Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2020-11-05 , DOI: 10.1016/j.cej.2020.127640 Peipei Dang , Qianqian Zhang , Dongjie Liu , Guogang Li , Hongzhou Lian , Mengmeng Shang , Jun Lin
The equivalent or hetero-valent substitution strategy is an efficient method for stimulating photoluminescence tuning or optimizing the photoluminescence performances of phosphor materials. A new K2NiF4-type layered perovskite SrLaZnO3.5:Bi3+ phosphor with broad-band yellow emission (558 nm) is first explored. Based on an efficient hetero-valent substitution strategy, a series of Sr1-xLa1+xZnO3.5+x/2:Bi3+ (0 ≤ x ≤ 0.4) solid solution phases are successfully constructed. The different Bi3+ local environments at two crystallographic sites and vacancy oxygen make the various distributions of emission and excitation spectra. Consecutive emission tuning from yellow (558 nm) to orange (585 nm), and improvement of emission intensity and internal quantum efficiency (IQE = 45%-64%) are achieved through La3+ hetero-valent substitution for Sr2+ in Sr1-xLa1+xZnO3.5+x/2:Bi3+ (0 ≤ x ≤ 0.4). The structural stability and Bi3+ occupation distribution in solid solution have been revealed by structural elaboration and crystal field regulation. Based on the both hetero-valent substitution and site-selective excitation strategies, a novel orange-red luminescence can be observed peaking at ∼609 nm under near-ultraviolet light (∼390 nm) excitation without visible absorption. The fabricated full-spectrum phosphor-converted white light-emitting diodes (pc-WLEDs) show outstanding warm white light, and a high color rendering index (Ra = 97.1, R9 = 98) is achieved, implying that the as-prepared Sr1-xLa1+xZnO3.5+x/2:Bi3+ (0 ≤ x ≤ 0.4) phosphors can used as yellow/orange-red components in pc-WLED lighting. These results indicate that hetero-valent substitution can predict and control site preference of luminescent centers, providing a new way for optimizing phosphor materials for solid-state lighting.
中文翻译:
Bi 3+掺杂的层状钙钛矿氧化物磷光体中橙红色发光的异价取代策略,用于高显色指数白色发光二极管
等效或杂价取代策略是一种刺激光致发光调谐或优化磷光体材料的光致发光性能的有效方法。首先研究了具有宽带黄光发射(558 nm)的新型K 2 NiF 4型层状钙钛矿SrLaZnO 3.5:Bi 3+荧光粉。根据一个有效的杂价替代战略,一系列的Sr 1- X的La 1+ X的ZnO 3.5+ X / 2:双3+(0≤ X ≤0.4)固溶体相构建成功。不同的Bi 3+在两个晶体学位置的局部环境和空位氧使发射光谱和激发光谱具有各种分布。通过La 3+取代Sr 2+中的Sr 2+可实现从黄色(558 nm)到橙色(585 nm)的连续发射调谐,并提高了发射强度和内部量子效率(IQE = 45%-64%)1- X的La 1+ X的ZnO 3.5+ X / 2:双3+(0≤ X ≤0.4)。结构稳定性和Bi 3+通过结构精细化和晶体场调节揭示了固溶体中的职业分布。基于异价取代和位点选择性激发策略,可以观察到一种新型的橙红色发光,在近紫外光(〜390 nm)激发下在〜609 nm达到峰值,而没有可见吸收。制成的全光谱磷光体转换白光发光二极管(pc-WLED)显示出出色的暖白光,并实现了高显色指数(Ra = 97.1,R9 = 98),这意味着所制备的Sr 1 - X拉1+ X的ZnO 3.5+ X / 2:双3+(0≤ X≤0.4)的磷光体可用作pc-WLED照明中的黄色/橘红色成分。这些结果表明,异价取代可以预测和控制发光中心的位置偏爱,为优化固态照明的荧光粉材料提供了一种新方法。