Solid State Science and Technology, Vol. 15, No 1 (2007) 169-175

ISSN 0128-7389

Corresponding Author: izdihar@iiu.edu.my

169

COMPARATIVE STUDY BETWEEN MICROWAVE HEATING TECHNIQUE

AND CONVENTIONAL HEATING TECHNIQUE IN PREPARING

Sr4Al14O25:Eu2+ POWDER SAMPLES

 

Izdihar Ishaka and Alias Daudb

aMatriculation Center, International Islamic University

bPhysics Dept., University of Malaya, Kuala Lumpur

 

ABSTRACT

Comparative studies were done on the Sr4Al14O25:Eu2+ samples prepared using the conventional heating technique and microwave heating technique. A simple microwave heating system was designed for firing the phosphor samples. The system consists of metal chamber fitted with an 800W magnetron operating at 2.45 GHz. The synthesis technique prior to the microwave heating will be described. In the conventional method, the samples were sintered in a tube furnace at a temperature of 1200oC for three hours in flowing N2/H2 (90%/10%) environment. However for the samples sintered using microwave, only a quarter of the time is needed. The X-Ray diffraction (XRD) data indicates that the sample is polycrystalline and acquires the host structure. The Photoluminescence (PL) and Photoluminescence Excitation (PLE) spectra for the powder phosphor prepared show similar results as those prepared using the conventional method. The Sr4Al14O25;Eu2+ powder samples doped with Eu2+ show strong blue green emission peaking at 538nm. The Scanning Electron Microscope (SEM) picture taken shows that the crystal size of the microwave irradiated samples is smaller in comparison to those prepared using the conventional method. These results indicate that the microwave heating technique is a reliable, fast and suitable technique to produce these powder phosphors. The characteristics of these phosphors are as good as those prepared using the conventional heating technique.

 

 

REFERENCES

[1]. Shigeo Shionoya, William M. Yen, Phosphor Handbook, CRC Press,(1999).

[2]. S.A. Studenikin, Micheal Cocivera, Luminescent properties of Eu2+ ion in

BaMg(1+x)SixAl10Oy films prepared by spray pyrolisis, Thin Solid Films, 394,

pp 264-271, (2001).

[3]. M.K.Chong, K.Pita, C.K.Kam, Photolumenescence of sol-gel derived

Y2O3:Eu3+ thin-film phosphors with Mg2+ and Al3+ codoping, Appl. Phys., A

79, pp 433-437 (2004).

[4]. C.F.Bacalski, M.A.Cherry, G.A.Hirata, J.M.McKittrick, J.Mourant, The

Effects of fuel-to-oxidizer ratio on luminescence properties and particle

morphology of combustion-synthesized europium-activated barium

magnesium aluminate, Journal of SID, Supplement-1, (2000)

[5]. Alias Daud, Masahiko Kitagawa, Shosaku Tanaka, Hiroshi Kobayashi, The

Role of Charge Transfer State and (4f)n-1(5d) Excited State in the Excitation

Dynamics of Rare-Earth Luminescent Centers, Vol. 25, pp. 153-168, (1994).

[6]. Ping Yang, Guang-Qing Yao, Juan-Hua Lin, Energy transfer and

photoluminescence of BaMgAl10O17 co-doped with Eu2+ and Mn2+, (2004).

[7]. Chaoyong Deng, Weidong Zhuang, Dawei He, Yongsheng Wang, Kai Kang,

Xiaowei Huang, Luminescence of Bax-0.05MgAl10O16+x:Eu2+ with different

Ba2+ content, Physics B, 344, pp 470-476 (2004)