Sains Malaysiana 44(5)(2015): 753–760

 

Eu and Dy co-activated SrB2Si2O8 Blue Emitting Phosphor: Synthesis and Luminescence Characteristics

(Fosfor SrB2Si2O8 didopkan dengan Eu dan Dy yang Memancarkan Cahaya Biru: Sintesis dan Ciri-ciri Luminesen)

 

T.Q. LEOW1, R. HUSSIN1*, Z. IBRAHIM1, K. DERAMAN1, W.N.W. SHAMSURI1 & H.O. LINTANG2

 

1Phosphor Research Group, Department of Physics, Faculty of Science,

Universiti Teknologi Malaysia, Skudai 81310, Johor Darul Takzim, Malaysia

 

2Catalytic Science and Technology (CST) Research Group, Ibnu Sina Institute for Fundamental Science Studies, Universiti Teknologi Malaysia, Skudai 81310, Johor Darul Takzim, Malaysia

 

 

Diserahkan: 24 Ogos 2014/Diterima: 26 Januari 2015

 

ABSTRACT

The main focus in this research was to understand the influence of Dy3+ and Eu3+ doping/co-doping and sintering atmosphere on the luminescence properties of SrB2Si2O8. Single phase Eu and Dy doped/co-doped SrB2Si2O8 ceramics were synthesized in different atmosphere through solid state reaction technique. An inexpensive method was occupied to provide reducing sintering atmosphere. Europium doped SrB2Si2O8 exhibit unusual reduction from trivalent to a divalent oxidation state even in an oxidizing atmosphere. We also discovered co-doping with Dy3+ ions produced further europium reduction in this phosphor. By manipulating the sintering condition and co-doping, a reddish-purple to blue tune-able phosphor under 390 nm excitations were produced and their Commission International del’Eclairage (CIE) color coordination were calculated and plotted in a CIE 1931 diagram. Photoluminescence spectra of the Eu2+/Eu3+ and Dy3+ co-doped SrB2Si2O8 phosphor showed energy transfer from Dy3+ to Eu3+ and Eu2+ which was observable in Dy3+ f-f excitation transitions and the Dy-O charge transfer bands. A weak 777 nm emission from 3p5P to 3s5S0 transition of O2- ions were observed in all the samples. The excitation and emission peaks of f - f transition from Dy3+ and Eu3+ as well as 4f - 5d transition of Eu2+ were also discussed. The long excitation band in ultraviolet (UV) region from these doped/co-doped SrB2Si2O8 ceramics produced phosphors with efficient UV excitation for solid state lighting.

 

Keywords: Co-doping; energy transfer; Eu3+ reduction in air; photoluminescence; SrB2Si2O8

 

ABSTRAK

Fokus utama dalam kajian ini adalah untuk memahami pengaruh pengedopan Dy3+ dan Eu3+ dan juga atmosfera pensinteran pada ciri-ciri luminesen SrB2Si2O8. Fasa tunggal seramik SrB2Si2O8 yang didopkan dengan Eu dan Dy telah disintesis dalam suasana yang berbeza melalui teknik tindak balas keadaan pepejal. Kaedah yang berkos rendah telah digunakan untuk menyediakan suasana pensinteran menurun. SrB2Si2O8 yang didopkan dengan europium menunjukkan penurunan yang luar biasa daripada keadaan pengoksidaan trivalen kepada dwivalens walaupun dalam suasana pengoksidaan. Kami juga mendapati pengedopan bersama dengan ion Dy3+ menghasilkan lebih penurunan europium dalam fosfor ini. Dengan memanipulasikan atmosfera pensinteran dan pengedopan, sinaran merah-ungu ke biru diperoleh apabila fosfor dipancar dengan ujaan sinaran 390 nm. Koordinasi warna Jawatan kuasa Antarabangsa del’Eclairage (CIE) fosfor tersebut telah diambil dan diplotkan dalam gambar rajah CIE 1931. Spektra fotoluminesen fosfor SrB2Si2O8 yang didopkan bersama dengan Eu2+/Eu3+ dan Dy3+ menunjukan pemindahan tenaga dari Dy3+ ke Eu3+ dan Eu2+ yang boleh diperhatikan dalam transisi pengujaan f-f dari Dy3+ dan Dy-O band pemindahan caj. Sinaran 777 nm yang lemah daripada transisi ion O2- 3p5P ke 3s5S0 juga diperhatikan dalam semua sampel. Puncak pengujaan dan pemancaran transisi f-f dari Dy3+ dan Eu3+ disertakan dengan transisi 4f - 5d dari ion Eu2+ juga dibincangkan. Jalur pengujaan yang panjang dalam rantau ultraungu (UV) daripada seramik SrB2Si2O8 didopkan dengan logam nadir bumi menghasilkan fosfor yang bole diuja dalam UV dengan berkesan demi kegunaan dalam pencahayaan keadaan pepejal.

 

Kata kunci: Eu3+ pengurangan udara; fotoluminesen; pemindahan tenaga; pengedopan; SrB2Si2O8

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*Corresponding author; email: roslihussin@utm.my

 

 

 

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