LOU Zhi-dong, YI Lan-jie, TENG Feng, XU Zheng, YANG Sheng-yi. Cathodoluminescence of BaAl<sub>2</sub>O<sub>4</sub> Films Co-doped with Tm,Tb and Eu[J]. Chinese Journal of Luminescence, 2007,28(3): 373-377
LOU Zhi-dong, YI Lan-jie, TENG Feng, XU Zheng, YANG Sheng-yi. Cathodoluminescence of BaAl<sub>2</sub>O<sub>4</sub> Films Co-doped with Tm,Tb and Eu[J]. Chinese Journal of Luminescence, 2007,28(3): 373-377DOI:
Cathodoluminescence of BaAl2O4 Films Co-doped with Tm,Tb and Eu
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 (BaAl
2
O
4
) 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 BaAl
2
O
4
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 BaAl
2
O
4
: Tm
3+
film has the main emission wavelength at 462nm
and the highest cathodoluminescence (CL) luminance and efficiency at 5kV and 57μA/cm
2
were 25cd/m
2
and 0.11lm/W
respectively. For the BaAl
2
O
4
: Tb
3+
film with the main wavelength at 549nm
the highest CL luminance and efficiency at the same condition were 120cd/cm
2
and 0.55 lm/W
respectively. A luminance of 50cd/m
2
and efficiency of 0.23lm/W were obtained for red emission at 616nm of the BaAl
2
O
4
: Eu
3+
film grown on glass. Bright blue emission peaking at 452nm was obtained in the BaAl
2
O
4
: Eu
2+
film grown on an aluminosilicate ceramic plate and annealed in N
2
:H
2
(95:5) at 1100℃. Its luminance and efficiency were 640cd/m
2
and 2.93lm/W
respectively.
关键词
喷雾热解法阴极射线发光亮度和效率
Keywords
spray pyrolysiscathodoluminescenceluminance and efficiency
references
Blasse G,Bril A.Fluorescence of Eu2+-activated alkaline-earth aluminates[J].Philips Res.Rep.,1968,23:201-206.
Palilla C F,Levine K A,Tomkus R M.Fluorescent properties of alkaline earth aluminates of the type M Al2O4 activated by divalent europium[J].J.Electrochem.Soc.:Solid State Sci.,1968,115(6):642-644.
Poort H M S,Blokpoel P W,Blasse G.Luminescence of Eu2+ in barium and strontium aluminate and gallate[J].Chem.Mater.,1995,7(8):1547-1551.
Golego N,Cocivera M.Polycrystalline RbTiOPO4 and KTiOPO4 bilayer thin films by spray pyrolysis[J].Thin Solid Films,1998,322(1-2):14-20.
Huignard A,Aron A,Aschehoug P,et al.Growth by laser ablation of Y2O3 and Tm:Y2O3 thin films for optical applications[J].J.Mater.Chem.,2000,10(2):549-554.
Choe Y J,Ravichandran D,Blomquist S M,et al.Alkoxy sol-gel derived Y3-xAl5O12:Tbx thin films as efficient cathodoluminescent phosphors[J].Appl.Phys.Lett.,2001,78(21):3800-3802.
Blasse G.Energy transfer between inequivalent Eu2+ ions[J].J.Solid State Chem.,1986,62(2):207-211.
Studenikin A S,Cocivera M.Luminescent properties of Eu2+ ion in BaMg(1+x)SixAl10Oy films prepared by spray pyrolysis[J].Thin Solid Films,2001,394(1-2):263-270.