Jeong H S, Kim S H, Bang H S, Choo D C, Kim T W, Hwang D H, Kwon M S, Chu C
Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, Korea.
J Nanosci Nanotechnol. 2012 Feb;12(2):1654-7. doi: 10.1166/jnn.2012.4588.
The optical properties of white organic light-emitting devices (WOLEDs) fabricated utilizing a CaAl12O19:Mn and Zn2SiO4:Mn phosphor layer were investigated. X-ray diffraction patterns for CaAl12O19:Mn and Zn2SiO4:Mn phosphors showed that Mn ions in the CaAl12O19:Mn phosphors were completely substituted into Ca ions and that Mn ions in the Zn2SiO4:Mn phosphors were completely substituted into Zn ions. Field emission scanning electron microscopy images showed that the size of the CaAl12O19:Mn phosphor was approximately between 0.1 and 3 microm, and that the size of the Zn2SiO4:Mn phosphor was smaller than 7 microm. The color coordinates of the electroluminescence spectra for WOLEDs with phosphor thicknesses of 0.25 and 0.35 mm shifted to the white emission side because the generated blue light from the blue OLEDs combined with the red and green lights was converted by the CaAl12O19:Mn and the Zn2SiO4:Mn phosphor down-conversion layers.
研究了利用CaAl12O19:Mn和Zn2SiO4:Mn磷光体层制备的白色有机发光器件（WOLED）的光学性质。CaAl12O19:Mn和Zn2SiO4:Mn磷光体的X射线衍射图谱表明，CaAl12O19:Mn磷光体中的Mn离子完全取代了Ca离子，Zn2SiO4:Mn磷光体中的Mn离子完全取代了Zn离子。场发射扫描电子显微镜图像表明，CaAl12O19:Mn磷光体的尺寸约在0.1至3微米之间，Zn2SiO4:Mn磷光体的尺寸小于7微米。磷光体厚度为0.25和0.35毫米的WOLED的电致发光光谱的色坐标向白色发射侧移动，这是因为来自蓝色OLED产生的蓝光与红色和绿色光相结合后被CaAl12O19:Mn和Zn2SiO4:Mn磷光体下转换层转换。
