Malaysian Journal of Analytical Sciences Vol 24 No 5 (2020): 783 - 790

 

 

 

 

STRUCTURAL AND OPTICAL PROPERTIES OF DYSPROSIUM AND EUROPIUM CO-DOPED WITH YTTRIUM ALUMINIUM GARNET NANOCRYSTALLINE POWDERS PREPARED BY COMBUSTION SYNTHESIS

 

(Sifat-sifat Struktural dan Optikal daripada Serbuk Nanokristal Dysprosium dan Europium Di-ko-dopkan dengan Yattrium Aluminium Garnet yang Disediakan Secara Sintesis Pembakaran)

 

Abd Rahman Tamuri*, Nor Ezzaty Ahmad, Nurliyana Nabilah Ghazali, Rosli Husin

 

Physics Department, Faculty of Science,

Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia.

 

*Corresponding author:  rahmantamuri@utm.my

 

 

Received: 13 November 2019; Accepted: 3 September 2020; Published:  12 October 2020

 

 

Abstract

This paper presents the study on synthesized yttrium aluminum garnet (YAG), europium-doped YAG (YAG: Eu), and europium and dysprosium co-doped YAG (YAG: Eu, Dy) phosphors prepared by combustion synthesis (CS) using a mixture of fuel (urea). The effects of Eu3+ and Dy3+ ions concentration and annealing temperature were analysed using by X-ray diffraction (XRD) and photoluminescence (PL). YAG nano-crystalline powders were calcined at a temperature range of 900 ℃ to 1200 ℃ for 4 hours. Europium and dysprosium were added in different concentrations in the range of 0.1 at.% to 1.0 at.% to the coarsened pure YAG particles to understand its influences on the optical properties and sintered microstructures. The doping of YAG: Eu and co-doped YAG: Eu, Dy was calcined at 1100 ℃ for 4 hours. X-ray diffraction results showed the phosphors are single-phase YAG with crystalline sizes ranging from 30 to 40 nm. The room temperature photoluminescence results confirmed the introduction of the ion in the host lattice and its optical activation for all the Eu3+ and Dy³⁺ ions concentrations. The CIE1931 color coordinates showed the sample's emission laid in the near red region for Eu³⁺ ion concentration and near white region for the addition of Eu³⁺ and Dy³⁺ ion concentration. Eu³⁺ ion concentration of 1.0 at.% achieved the highest emission spectra intensity while the highest emission spectra was achieved at 0.5 at.% for Dy³⁺ ion concentration and the ion luminescence were preferentially excited with 395 nm for YAG: Eu while, 353 nm for YAG: Eu, Dy wavelength photons.

 

Keywords:  YAG: Eu, Dy, europium, dysprosium, combustion synthesis, emission, urea

 

Abstrak

Kertas kerja ini membentangkan kajian hasil sintesis yttrium aluminium garnet (YAG), YAG Europium-doped (YAG: Eu) dan europium dan dysprosium bersama-sama doped YAG (YAG: Eu, Dy) fosfor yang disediakan oleh sintesis pembakaran (CS) menggunakan campuran bahan api (urea). Kesan kepekatan Eu³⁺ dan Dy³⁺ ion dan suhu kalsinasi telah dikaji oleh belauan sinar-X (XRD) dan fotoluminesens (PL). Serbuk YAG nano-kristal telah dikalsinasi dalam julat suhu 900 ℃ hingga 1200 ℃ selama 4 jam. Europium dan dysprosium ditambah dengan kepekatan yang berlainan dalam julat 0.1% hingga 1.0% kepada zarah YAG tulen untuk memahami pengaruhnya terhadap sifat optikal dan mikrostruktur sintered. Dop YAG: Eu dan ko-dop YAG: Eu, Dy telah dikalsinasi pada suhu 1100 ℃ untuk 4 jam. Keputusan belauan sinar-X menunjukkan bahawa fosfor adalah berfasa tunggal YAG dengan saiz kristal antara 30 nm hingga 40 nm. Hasil fotoluminensi pada suhu bilik mengesahkan pengenalan ion dalam kekisi tuan rumah dan pengaktifan optikal untuk semua kepekatan Eu³⁺ dan Dy³⁺ ions. Koordinat warna CIE1931 menunjukkan bahawa spektrum pancaran sampel terletak di kawasan merah berhampiran untuk kepekatan Eu³⁺ ion dan berhampiran kawasan putih untuk penambahan kepekatan Eu³⁺ dan Dy³⁺ ion. Keamatan spektrum pancaran tertinggi dicapai untuk kepekatan Eu³⁺ ion pada 1.0 % sementara kepekatan 0.5% pada ion Dy³⁺ dan pengujaan lebih sesuai pada panjang gelombang 395 nm untuk YAG: Eu manakala, 353 nm untuk YAG: Eu, Dy.

 

Kata kunci:  YAG: Eu, Dy, europium, dysprosium, sintesis pembakaran, pancaran, urea

 

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