Chen Wanping, Zhang Xinzhu, Wang Liping
Key Laboratory of Rare Earth Optical and Electronic Materials and Devices, Huaihua University, Huaihua, People's Republic of China.
Luminescence. 2017 Sep;32(6):952-956. doi: 10.1002/bio.3276. Epub 2017 Jan 24.
A blue-emitting phosphor Ca Al O F :Eu was synthesized using a high-temperature solid-state reaction under a reductive atmosphere. The X-ray diffraction measurements indicate that a pure phase Ca Al O F :Eu can be obtained for low doping concentration of Eu . The phosphor has a strong absorption in the range 270-420 nm with a maximum at ~340 nm and blue emission in the range 400-500 nm with chromatic coordination of (0.152, 0.045). The optimal doping concentration is ~0.24. In addition, the luminescence properties of the as-synthesized phosphor were evaluated by comparison with those of Ca Al O Cl :Eu and the commercially available phosphor BaMgAl O :Eu . The emission intensity of Ca Al O F :Eu was ~72% that of BaMgAl O :Eu under excitation at λ = 375 nm. The results indicate that Ca Al O F :Eu has potential application as a near-UV-convertible blue phosphor for white light-emitting diodes.
采用高温固态反应在还原气氛下合成了蓝色发光荧光粉CaAlOF:Eu。X射线衍射测量表明，对于低掺杂浓度的Eu，可获得纯相CaAlOF:Eu。该荧光粉在270 - 420nm范围内有强吸收，最大吸收波长约为340nm，在400 - 500nm范围内有蓝色发射，色坐标为(0.152, 0.045)。最佳掺杂浓度约为0.24。此外，通过与CaAlOCl:Eu和市售荧光粉BaMgAlO:Eu的发光性能进行比较，对合成的荧光粉的发光性能进行了评估。在λ = 375nm激发下，CaAlOF:Eu的发射强度约为BaMgAlO:Eu的72%。结果表明，CaAlOF:Eu作为白光发光二极管的近紫外可转换蓝色荧光粉具有潜在的应用价值。
