Dai Peng-Peng, Li Cong, Zhang Xin-Tong, Xu Jun, Chen Xi, Wang Xiu-Li, Jia Yan, Wang Xiaojun, Liu Yi-Chun
Center for Advanced Optoelectronic Functional Materials Research, and Key Laboratory for UV-Emitting Materials and Technology of Ministry of Education, Northeast Normal University, 5268 Renmin Street, Changchun 130024, China.
Department of Chemistry, University of Zurich, , The X-ray Crystallography Facility and The Linden Research Group, Winterthurerstrasse, 190 CH-8057 Zurich, Switzerland.
Light Sci Appl. 2016 Feb 12;5(2):e16024. doi: 10.1038/lsa.2016.24. eCollection 2016 Feb.
Single-phased, high-color-rendering index (CRI) white-light phosphors are emerging as potential phosphor-converted white-light-emitting diodes (WLEDs) and as an alternative to blends of tricolor phosphors. However, it is a challenge to create a high CRI white light from a single-doped activator. Here, we present a high CRI (Ra = 91) white-light phosphor, Sr(PO)(BO)Cl:Eu, composed of Sr(PO)Cl as the beginning member and Sr(BO)Cl as the end member. This work utilized the solid-solution method, and tunable Eu emission was achieved. Color-tunable Eu emissions in response to structural variation were observed in Sr(PO)(BO)Cl solid solutions. This was further confirmed using X-ray Rietveld refinement, electron paramagnetic resonance spectroscopy, and in the photoluminescence spectra. The color-tunable emissions included the white light that originated from the combination of the blue emission of Sr(PO)Cl:Eu and an induced Eu yellow emission at approximately 550 nm in the solid solution. Importantly, the white-light phosphors showed a greater R9 = 90.2 under excitation at 365 nm. This result has rarely been reported in the literature and is greater than that of (R9 = 14.3) commercial YAO:Ce-based WLEDs. These findings demonstrate the great potential of Sr(PO)(BO)Cl:0.04Eu as a white-light phosphor for near-UV phosphor-converted WLEDs. These results also provide a shortcut for developing a high CRI white-light phosphor from a single Eu-doped compound.
单相、高显色指数（CRI）的白光磷光体正在成为潜在的磷光体转换白光发光二极管（WLED），并可作为三色磷光体混合物的替代品。然而，从单一掺杂激活剂产生高显色指数的白光具有挑战性。在此，我们展示了一种高显色指数（Ra = 91）的白光磷光体Sr(PO)(BO)Cl:Eu，它由Sr(PO)Cl作为起始成员和Sr(BO)Cl作为末端成员组成。这项工作采用了固溶体方法，并实现了可调谐的Eu发射。在Sr(PO)(BO)Cl固溶体中观察到了响应结构变化的颜色可调谐Eu发射。这通过X射线Rietveld精修、电子顺磁共振光谱以及光致发光光谱得到了进一步证实。颜色可调谐发射包括源自Sr(PO)Cl:Eu的蓝色发射与固溶体中约550 nm处诱导的Eu黄色发射相结合的白光。重要的是，在365 nm激发下，白光磷光体显示出更大的R9 = 90.2。这一结果在文献中很少报道，并且大于商业YAO:Ce基WLED的（R9 = 14.3）。这些发现证明了Sr(PO)(BO)Cl:0.04Eu作为用于近紫外磷光体转换WLED的白光磷光体具有巨大潜力。这些结果也为从单一Eu掺杂化合物开发高显色指数白光磷光体提供了一条捷径。
