铥、铽及铕离子掺杂的BaAl_2O_4膜的阴极射线发光特性  

Cathodoluminescence of BaAl_2O_4 Films Co-doped with Tm,Tb and Eu

作　　者：娄志东[1] 衣兰杰[1] 滕枫[1] 徐征[1] 杨盛谊[1] 

机构地区：[1]北京交通大学光电子技术研究所

出　　处：《发光学报》2007年第3期373-377,共5页Chinese Journal of Luminescence

基　　金：国家"973"计划(2003CB314707);国家自然科学重点基金(10434030);国家自然科学基金(90301004);北京市自然科学基金(2062019);北京交通大学校基金(2006XM040)资助项目

摘　　要：利用喷雾热解法合成了Tm、Tb及Eu离子掺杂的铝酸钡(BaAl2O4)发光膜,研究了合成条件对其结构和发光特性的影响。在退火温度达到700℃时,生成了BaAl2O4膜。Tm3+和Tb3+掺杂的BaAl2O4膜分别发蓝光和绿光,而Eu3+掺杂的BaAl2O4膜的发光既有Eu2+的特征发射——宽的蓝光发射带,也有Eu3+的特征发射——窄的红光发射峰。BaAl2O4∶Tm3+的发射主峰位于462nm,在电压为5kV和电流密度为57μA/cm2的条件下,其阴极射线发光(CL)亮度可达25cd/m2,效率可达0.11lm/W。BaAl2O4∶Tb3+的发射主峰位于549nm,在相同的条件下,其阴极射线发光亮度可达120cd/m2,效率可达0.55lm/W。BaAl2O4∶Eu3+的发射主峰位于616nm,其阴极射线发光亮度为50cd/m2,效率为0.23lm/W。BaAl2O4∶Eu2+发蓝光,峰值位于452nm,其阴极射线发光亮度为640cd/m2,效率为2.93lm/W。The most efficient phosphors currently available for fluorescent lamps, cathode-ray tubes, and flat panel displays are sulfides. Recently, there is growing interest in developing thin film oxide phosphors doped with transition metal or rare earth ions because they are chemically and thermally more stable. In addition, it is well known that thin film phosphors have advantages such as high contrast ratio, high ambient visibility, high image resolution and good heat resistance in display applications. For these reasons oxide-based thin film phosphors have been widely studied. In this paper, thin films of barium aluminate （BaAl2O4 ） doped separately with thulium, terbium, and europium were deposited by a spray pyrolysis method. The effects of preparation conditions on the structural and luminescence properties of the films were investigated. Polycrystalline BaAl2O4 films were formed at an annealing temperature above 700 ℃. Tm^3 ＋ and Tb^3＋ doped films deposited on glass emitted blue and green light, respectively. While in the films doped with europium, both red emission lines from Eu^3＋ and a broad blue or blue-green emission band from Eu^2＋ were observed. The BaAl2O4： Tm^3＋ film has the main emission wavelength at 462 nm, and the highest eathodolumineseenee （CL） luminance and efficiency at 5 kV and 57 μA/cm^2 were 25 cd/m^2 and 0.11 lm/W, respectively. For the BaAl2O4： Tb^3＋ film with the main wavelength at 549 nm, the highest CL luminance and efficiency at the same condition were 120 cd/cm^2 and 0.55 lm/W, respectively. A luminance of 50 cd/m^2 and efficiency of 0.23 lm/W were obtained for red emission at 616 nm of the BaA12O4： Eu^3＋ film grown on glass. Bright blue emission peaking at 452 nm was obtained in the BaAl2O4： Eu^2＋ film grown on an aluminosilieate ceramic plate and annealed in N2： H2 （95：5 ） at 1 100 ℃. Its luminance and efficiency were 640 cd/m^2 and 2.93 lm/W, respectively.

关 键 词：喷雾热解法 阴极射线发光 亮度和效率 

分 类 号：O482.31[理学—固体物理]