Synthesis, characterisation and spectroscopic properties of GdOF:Eu³⁺ phosphors and their Judd-Ofelt analysis
by N. Dhananjaya; S.R. Yashodha; C. Shivakumara
International Journal of Nanotechnology (IJNT), Vol. 14, No. 9/10/11, 2017

Abstract: A series of Eu³⁺-doped gadolinium oxyfluoride (GdOF) phosphors (1-9 mol%) were successfully prepared by a low temperature solid state method. The phosphors were characterised by powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), UV-Visible (UV-Vis) absorption and photoluminescence (PL) spectroscopy. Rietveld refinement of PXRD data confirmed that all the compounds were crystallised in the rhombohedral structure. The photoluminescence properties were investigated under 254 nm excitation wavelengths. On substitution of Eu³⁺ ion to Gd³⁺-site in GdOF, the photoluminescence spectra exhibit ⁵D₀ → ⁷F₀ (579 nm), ⁵D₀ → ⁷F₁ (593 nm), ⁵D₀ → ⁷F₂ (612, 620 nm), ⁵D₀ → ⁷F₃ (651 nm) and ⁵D₀ → ⁷F₄ (705 nm) transitions. Judd-Ofelt theory was applied to evaluate the intensity parameters (Ω₂, Ω₄) of Eu³⁺-doped GdOF phosphors. The transition probabilities (A_T), radiative lifetime (τ_rad), and branching ratio (β) were investigated by using the intensity parameters. CIE colour coordinates confirmed that the Eu³⁺-doped GdOF phosphors exhibit red luminescence. The obtained results revealed that the present phosphors can be a potential candidate for red component in white LEDs applications.

Online publication date: Sun, 24-Sep-2017

The full text of this article is only available to individual subscribers or to users at subscribing institutions.

 
Existing subscribers:
Go to Inderscience Online Journals to access the Full Text of this article.

Pay per view:
If you are not a subscriber and you just want to read the full contents of this article, buy online access here.

Complimentary Subscribers, Editors or Members of the Editorial Board of the International Journal of Nanotechnology (IJNT):
Login with your Inderscience username and password:

Username:        Password:          Forgotten your password?

Want to subscribe?
A subscription gives you complete access to all articles in the current issue, as well as to all articles in the previous three years (where applicable). See our Orders page to subscribe.

If you still need assistance, please email subs@inderscience.com