The Role of Eu3+ Ion on Luminescence, TL Kinetic Parameter and Electrochemical Behaviors of Sr0,5Ca0,5WO4 Phosphor Synthesized via Sol-Gel Technique

Öz

The Eu3+doped Sr0,5Ca0,5WO4 has been synthesized by the sol-gel method for the first time. The phosphors were analyzed by XRD, SEM, DTA/TG optical absorption spectra, radioluminescence (RL), photoluminescence (PL), and thermoluminescence (TL) spectra. The energy transfer mechanism was determined on Eu3+ doped Sr0,5Ca0,5WO4 phosphor. The XRD results reveal that the samples exhibit a tetragonal scheelite structure. FT-IR spectra provide the proof of scheelite structure with W-O anti-symmetric stretching vibration in [WO4]2- tetrahedrons at 750-910 cm-1. The Sr0,5Ca0,5WO4 phosphor showed a broad emission between 350-750 nm with a maximum of 506 nm. Sr0,5Ca0,5WO4:0.5Eu3+ phosphor exhibit characteristic emissions of Eu+3 (545, 592, 614, 650, and 700 nm) in the RL spectrum. The host material has excellent energy transfer efficiency for lanthanide ions. The kinetic parameters were calculated by the computerized glow curve deconvolution (CGCD) analysis method. As a result of CGCD, three peaks (Etrap:0.74-1.46 eV) for un-doped Sr0,5Ca0,5WO4 and five peaks (Etrap:0.75-1.28 eV) for Sr0,5Ca0,5WO4: Eu3+ were determined under main TL glow curve. In the cyclic voltammogram of the doped sample, an oxidation peak of about -0.4 eV, which is thought to be derived from Eu3+, was observed. Based on the results, the Sr0,5Ca0,5WO4:Eu+3 phosphors may be potential applicants for LEDs.

Anahtar Kelimeler

• Kinetic parameters
• luminescence
• rare earth doping
• sol-gel method

Sol-Jel Tekniği ile Sentezlenmiş Sr0,5Ca0,5WO4 Fosforunda Eu3+ İyonunun Lüminesans, TL Kinetik Parametreler ve Elektrokimyasal Davranışındaki Rolü

Öz

Eu3+katkılandırılmış Sr0,5Ca0,5WO4 sol-jel method ile ilk kez sentezlenmiştir. Forsforların DTA/TG, XRD, SEM, optik absorpsiyon, fotolüminesans (PL), radyolüminesans (RL) ve termolüminesans (TL) teknikleriyle analiz edilmiştir. Enerji transfer mekanizması Eu3+ katkılı fosfor için belirlenmiştir. XRD sonuçları örneklerin tetragonal şelit yapıda olduğu ortaya koymaktadır. RL spektrumlarında Sr0,5Ca0,5WO4 fosforu 350-750 nm aralığında 506 nm zirve yapan geniş bir emisyon bandı göstermiştir ve Sr0,5Ca0,5WO4:0.5Eu3+ fosofru Eu+3 iyonunun karakteristik (545, 592, 614, 650, and 700 nm) geçişlerini göstermiştir. Kinetik parametrelerin hesaplanmasında bilgisayarlı ışıma eğrisi ayrıştırma (CGCD) metodu kullanılmıştır. CGCD sonuçları, ana TL ışıma eğrilerinde Sr0,5Ca0,5WO4 örneği için üç ve Sr0,5Ca0,5WO4: Eu3+ fosforu için beş pik belirlenmiştir. Katkılandırılmış örneğin döngüsel voltamogramında Eu3+ dan kaynaklandığı düşünülen yaklaşık -0.4 eV’ lik bir oksidasyon zirvesi gözlendi. Bu sonuçlar temelinde Sr0,5Ca0,5WO4:Eu+3 fosforları ışık yayan diyot uygulamarı için potansiyel oluşturabilirler.

Anahtar Kelimeler

• kinetik parametre
• lüminesans
• nadir toprak doplama
• sol-jel metodu

Kaynakça

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