Structural and photoluminescence study of Mn²⁺‐activated CaYAl₃O₇ blue phosphors

Abstract

The structural and photoluminescence properties of CaYAl3 O7 phosphor material doped with varying concentration of Mn(2+) have been studied. The phosphor material was synthesized by the combustion method at 500 °C and was characterized using X-ray diffraction, Fourier transform infrared spectroscopy and photoluminescence spectroscopy (PL). X-ray diffraction showed that the crystallites have average sizes in the range of ~58-70 nm. Corresponding Fourier transform infrared spectroscopy investigations confirm the phase formation and the presence of aluminate group (Al-O bands) in CaYAl3 O7 :Mn(2+) phosphor. Under the excitation at 356 nm wavelength, the PL spectra show the occurrence of two emission peaks obtained in the blue region at 389 nm and 412 nm, which is attributed to the 4 T1(G) → 6A1 transition of Mn(2+) ion. Upon increasing Mn(2+) concentration, the relative PL intensity shows an initial decrement followed by an increase displaying the effect of concentration quenching. Overall the results suggest the possibility of using this material in white lighting devices and plasma display panels.

Li4Zn(PO4)2:Mn2+ thermosensitive phosphor with dual luminescent centres for optical thermometry

“…If Mn 2+ occupies a plurality of sites on the crystal lattice, multiple emission peaks may be visible in the emission spectrum. However, the temperature dependence of Mn 2+ doped into different coordination environments is different [20, 21]. Because of the strong electron–phonon coupling, the luminescence of Mn 2+ is highly vulnerable to thermal quenching, primarily attributed to the cross‐relaxation of energy levels between the 4 T 2 excited state and the 6 A 1 ground state [22].…”

A high temperature macroscopically flexible inorganic CaYAl3O7:Eu3+ nanofiber luminescent membrane

“…[18][19][20][21][22][23] Nowadays, rare earth ion doped aluminate nanophosphors with molten stone structures have attracted extensive attention due to their nice physical properties and potential applications in modern display devices, solid state lighting, luminescent coatings, bioluminescence labeling and optoelectronics. [24][25][26][27] The synthesis process of such luminescent materials requires suitable host lattices 28 and effective activators. 29,30 CaYAl 3 O 7 (hereafter referred to as CYA) is a kind of desirable host lattice because of its excellent chemical and thermal stability.…”