Zr0.98Dy0.01Sm0.01O2 Işıldarının Sentezi, Karakterizasyonu ve Fotolüminesans Özelliklerinin İncelenmesi

Bu çalışmada Pechini yöntemi kullanılarak nano-parçacık boyutlarında Zr0.99Dy0.01O2 ve Zr0.98Dy0.01Sm0.01O2 seramik ışıldarlarının sentezi gerçekleştirildi. Işıldarların kristal yapısı X- ışınları toz kırınım difraktometresiyle (XRD) belirlendi. Termal özelliklerin incelenmesinde ise termogravimetri-diferansiyel termal analiz (TG/DTA) sistemi kullanıldı. Taramalı Elektron Mikroskobu (SEM) ile toz ışıldarların yüzey analizleri yapılarak tanecik boyutları analiz edildi. Fotoluminesans özellikleri ve ışıma süreleri fotoluminesans spektrofotometresi (PL) ile incelendi. Zr0.98Dy0.01Sm0.01O2 sisteminin ışıma spektrumunda 565 nm, 620 nm, 653 nm ve 720 nm’de gözlenen ışıma bandlarının Sm3+ iyonunun 4G5/2→6H5/2, 4G5/2→6H7/2, 4G5/2→6H9/2 ve 4G5/2→6H11/2 karakteristik elektronik geçişlerine ait olduğu belirlendi. 495 nm gözlenen ışıma bandının ise Dy3+ iyonunun 4F9/2→6H15/2 elektronik geçişine karşılık geldiği tespit edildi. Zr0.99Dy0.01O2 sistemine Sm3+ iyonunun katkılanmasının ışıma süresini arttırdığı belirlendi.

Synthesis, Characterization and Investigation of Photoluminescence Properties of Zr0.98Dy0.01Sm0.01O2 Phosphor

In this work, nano particle size of Zr0.99Dy0.01O2 ve Zr0.98Dy0.01Sm0.01O2 phosphors were synthesized. The crystal structure of phosphors was characterized by X-ray powder diffractions (XRD). Thermogravimetry-differential thermal analysis (TG/DTA) system was used to determine thermal properties. Surface analyses of phosphors were analyzed using scanning electron microscope (SEM). Photoluminescence properties and decay times were investigated by photoluminescence spectrophotometer (PL). Luminescence bands observed at 565, 620, 653, 720 nm in the emission spectrum of Zr0.98Dy0.01Sm0.01O2. These bands are attributed to 4G5/2→6H5/2, 4G5/2→6H7/2, 4G5/2→6H9/2 ve 4G5/2→6H11/2 transitions of Sm3+ ions. The peak at 495 nm attributed to 4F9/2→6H15/2 transition of Dy3+ ions. It was determined that the decay time increased with the addition of Sm3+ ion to the Zr0.99Dy0.01O2 system.

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