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