Effect of Bi3+ and Li+ co-doping on the luminescence properties of Zn2TiO4:Eu3+ nanophosphor for display applications

Abstract

A novel Li + and Bi 3+ ions (0.5-2.0 mol%) co-doped Zn 2 TiO 4 :Eu 3+ (7 mol%) nanophosphors were synthesised by two step combustion route and its effect on luminescence characteristics are described. Addition of Li + and Bi 3+ ions does not introduce new luminescence characteristics but affects the intensity of Eu 3+ related emission. Crystalline structure were characterized by powder X-ray diffraction technique which confirms the formation of a cubic structure and the influence of synthesise conditions on surface morphology was examined by scanning electron microscopic technique. The photoluminescence (PL) properties of Li + and Bi 3+ ions (0.5-2.0 mol%) co-doped Zn 2 TiO 4 :Eu 3+ (7 mol%) show characteristic 4f-4f emissions of Eu 3+ ions at 578, 592, 613 and 654 nm, also reveals that the small quantity of co-dopant ions was highly effective for charge compensation as well as formation of lattice defects to boost the PL emission. Further, Commission International de I'E' clairge chromaticity and color purity results suggests that, the synthesised phosphor can be used as a red component for production of near ultraviolet based wLEDs, solid state lightning and display applications.

Color tunability and NIR luminescence in Cr3+/Li+ co-doped ZnGa2O4 phosphor for solid state lighting and NIR LEDs

“…As have been observed in several cases, the addition of Li + ion can improve the PL intensity of phosphor materials [14,15,22,23,[29][30][31]. In order to study the effect of Li + doping on the PL intensity of ZGO:0.5Cr 3+ and ZGO:0.5Cr 3+ /yLi + (y = 2, 5 and 7 mol%) phosphor samples upon λ exc = 260 and 302 nm and obtained spectra are shown in figures 10(a)-(d).…”

“…The emission intensity of different phosphor materials have been found to enhance by doping of different impurity ions, such as Li + , Na + , K + , Bi 3+ , Mg 2+ , Ca 2+ etc [20][21][22][23][24][25][26]. The Mg 2+ , Bi 3+ , and Si 4+ ions have been found to increase the near infrared (NIR) persistent luminescence intensity of the Cr 3+ :ZGO phosphor [27,28].…”

“…The Mg 2+ , Bi 3+ , and Si 4+ ions have been found to increase the near infrared (NIR) persistent luminescence intensity of the Cr 3+ :ZGO phosphor [27,28]. However, Li + ion has been widely used to enhance the emission intensity of different phosphor materials in many cases due to its small ionic size (0.76 Ǻ), which can be easily introduced in different host lattices [14,15,22,23,29]. Our group has also realized an enhancement in the emission intensity of Er 3+ /Yb 3+ codoped ZGO phosphor in presence of Li + ion [29].…”

Luminescent and thermal properties of novel orange–red emitting MgNb2O6:Sm3+ phosphors for displays, photo catalytic and sensor applications

“…According to Blasse, the critical distance (Rc) between two Sm 3+ activators can be calculated as [12,40]: where C; the critical dopant concentration = 0.05, N; the number of Mg ion in the unit cell = 8, and V; the volume of the unit cell = 407.02 Å 3 . Rc was found to be 12.46 Å, which is larger than 5 Å, for the present phosphor confirms that the non-radiative energy transfer is due to multipole-multipole interaction and is the main reason for quenching, in order to know the type of interaction like dipole-dipole (Q-6), dipole-quadrupole (Q-8) or quadrupole-quadrupole (Q-10), we have to utilize Dexter's theory and Van-Uitert equation [41] and by ploting log (X) V/s log (I/X) ( Fig.…”

“…Currently phosphor materials are extensively used in various applications relating to the production of synthetic light for liquid crystal displays, cathode ray tubes, lightemitting diodes, scintillators and many more [1][2][3]. However, these phosphor oxide materials have more significant and attained high potential interest to researchers due to their enhanced physico-chemical stability.…”