Mimosa pudica (L.) assisted green synthesis and photoluminescence studies of Y2O3:Mg2+ nanophosphor for display applications

International Conference on Advances in Materials and Manufacturing Applications 2016

Venkatachalaiah, K.N.^1,2 ; Venkataravanappa, M.^2,3 ; Nagabhushana, H.^4 ; Basavaraj, R.B.^4

Department of Physics, Amrita School of Engineering, Bangalore Campus, Amrita Vishwa- Vidyapeetam, Bengaluru

560035, India^1

Research and Development Centre, Bharathiar University, Coimbatore, India^2

GFGC Sira, Tumkur

572139, India^3

Prof. C.N.R. Rao Centre for Advanced Material Science, Tumakuru University, Tumakuru

572103, India^4

关键词: Agglomerated structures;    Blue light emissions;    Diffuse reflectance spectroscopy;    Excitation wavelength;    Mimosa pudica;    Powder X-ray diffraction (pXRD);    PXRD;    Y2O3:Mg^2+;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/149/1/012177/pdf
DOI  :  10.1088/1757-899X/149/1/012177

来源: IOP

【 摘 要 】

For the first time green route method was used to synthesize pure and Mg2+(1-11 mol %) doped Y2O3nanophosphors by using Mimosa pudica leaves extract as a fuel. The final product was well characterized by powder x-ray diffraction (PXRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS) and photoluminescence (PL).The PXRD result shows the formation of single phase, cubic structure of Y2O3with crystallite sizes ∼25 nm. The SEM results showed porous and agglomerated structures, TEM images showed the crystallite size of the material and was found to be around ∼ 25 nm. PL emission spectra show the blue light emission under the excitation wavelength of 315 nm. The emission peaks of Mg2+were observed at 428 nm, 515 nm and 600 nm corresponding to the transitions of4F9/2→6Hi7/2(violet),4F9/2→6Hi5/2(blue),4F9/2→6HJ3/2(yellow) respectively. The estimated CIE chromaticity co-ordinate was very close to the national television standard committee value of blue emission. CCT was found to be ∼ 6891 K as a result the present phosphor was potential to be used for warm white light emitting display applications.