Narrow-Band Green-Emitting Phosphor Ba2LiSi7AlN12:Eu2+ with High Thermal Stability Discovered by a Single Particle Diagnosis Approach

详细信息    查看全文

• 作者：Takashi Takeda ; Naoto Hirosaki ; Shiro Funahshi ; Rong-Jun Xie
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：September 8, 2015
• 年：2015
• 卷：27
• 期：17
• 页码：5892-5898
• 全文大小：445K
• ISSN：1520-5002

文摘

The narrow-band green-emitting phosphor Ba₂LiSi₇AlN₁₂:Eu²⁺ was discovered by analyzing a single particle in a powder mixture, which we call the single particle diagnosis approach. Single crystal X-ray diffraction analysis of the particle revealed that Ba₂LiSi₇AlN₁₂:Eu²⁺ crystallizes in the Pnnm space group (No. 58) with a = 14.0941 脜, b = 4.8924 脜, c = 8.0645 脜, and Z = 2. The crystal structure is composed of a corner-sharing (Si,Al)N₄ corrugated layer and edge-sharing (Si,Al)N₄ and LiN₄ tetrahedra. Ba(Eu) occupies the one-dimensional channel in a zigzag manner. The luminescence properties were also measured using a single crystalline particle. Ba₂LiSi₇AlN₁₂:Eu²⁺ shows a green luminescence peak at approximately 515 nm with a narrow full-width at half-maximum of 61 nm. It shows high quantum efficiency of 79% with 405 nm excitation and a small decrease of luminescence intensity even at 300 掳C.