Bulletin of ANPA

Abstract submitted to ANPA Conference July 14–16, 2023

Volume 5, Number 1

Condensed Matter Physics and Material Science

Abstract ID: ANPA2023-N00063

Abstract:

ANPA2023-N00063: Dysprosium doped Y3Ga4AlO12 and Lu3Ga4AlO12 nano-garnets for white light emitting diodes

Authors:

• Nepal Rama Devi; Ph.D. scholar

• B.D. Joshi(; professor(

• ) Prakash Raj Pant(; )lecturer(

• )R. Praveena; )reader(

• ; )

Trivalent dysprosium (Dy3+)-doped Y3Ga4AlO12 (YGAG) and Lu3Ga4AlO12 (LuGAG) nanocrystalline garnets have been synthesized by Pechini Sol-Gel method. These garnets were characterized by X-ray diffraction (XRD) method, scanning electron microscopy, Fourier Transform infrared spectroscopy and photoluminescence spectroscopy to determine structure, phase, morphology, vibrational modes and luminescence properties. From XRD results, it is noticed that these garnets are single phase with crystallite sizes of 16 and 19 nm for YGAG and LuGAG, respectively. Morphology results showed that, the particles are nearly spherical and agglomerated with an average grain size of 50-70 nm. From the excitation spectra, it is observed that these phosphors can be effectively excited by near ultraviolet and blue LEDs. Under the excitation of ultraviolet light at 360 nm, the photoluminescence spectra of both the samples consist of characteristic emission peaks at 489 nm (blue) and 579 nm (yellow) corresponding to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+, respectively. By substituting the Y3+ ions with Lu3+ ions, the luminescence intensity of Dy3+-doped LuGAG is slightly enhanced due to crystal-field effect around the Dy3+ ion. The CIE chromaticity co-ordinates of both the phosphors were located in the white light region. The results indicated that, both the phosphors can be utilized for the white light generation under 360 nm excitation.

To cite this abstract, use the following reference: https://anpaglobal.org/conference/2023/ANPA2023-N00063