A Novel Highly Efficient Host‐Sensitized Red Emitting (Ba₂YV₃O₁₁ : Eu³⁺) Phosphor for Hybrid White LEDs

Abstract

The present investigation focused on the sequence of Eu3+ activated red‐emitting vanadate phosphor for the high performance white LEDs. The blue emitting host lattice (Ba2YV3O11) and red emitting Ba2YV3O11 : Eu3+ phosphors were synthesized by the conventional solid‐state method and studied their optical properties in details. The host lattice and Eu3+ activated red phosphors were crystallized in the monoclinic crystal system. The Ba2YV3O11 emission was found in the bluish‐green region (444 and 512 nm, which corresponds to the 3T2→1A1 and 3T1→1A1 transitions), and the Eu3+ activated phosphors (Ba2Y1‐xEuxV3O11, x=0‐1, insteps of 0.1) display intense red emission at 618 nm due to the 5D0→7F2 electric dipole (ED) transition. The concentration quenching was observed at x=0.6, the detailed energy transfer mechanism was also explored. Thermal stability of the Ba2Y0.4Eu0.6V3O11 red phosphor retains the ∼60 % emission intensity at 423 K, and the internal quantum efficiency (IQE) was found to be 30 %. The red and white LEDs were fabricated by using the synthesized red phosphor with the combination of near UV LED (n‐UV), the white LED showed white emission with CIE is x=0.359; y=0.395; higher CRI (89) and low CCT (4693 K) values. These results prescribe that the presently synthesized phosphor can act as a suitable red‐emitting component in hybrid white LEDs.

Multicolor tunable bright photoluminescence in Ca2+/Mg2+ modified Eu3+ doped ZnGa2O4 phosphors under UV excitation for solid state lighting applications

“…14(a and b), the PL emission intensity of Eu 3+ bands reduces continuously with the rise in temperature due to thermal quenching effect. [29][30][31][32][33] The emission intensity of 613 nm emission band is reduced upto 58.43% and 64.88% at 423 K for the ZnGa 2 O 4 :0.1Eu 3+ [see Fig. 14(c)] and ZnGa 2 O 4 :0.1Eu 3+ /3Ca 2+ [see Fig.…”

Ba2YV3O11 Er3+/Yb3+ Nanostructures for Temperature Sensing in the Presence of Bismuth Ions

“…Vanadates with excellent chemical stability and low phonon energy may be appropriate materials for temperature-sensing mediums. Because of the comparable radius and ionic valence of Y 3+ and rare-earth ions, Ba 2 YV 3 O 11 (BYVO) is a novel form of yttrium vanadate that is a suitable luminous matrix for rare-earth ion doping. , For example, BYVO:Eu 3+ phosphor has already been published showing a high-performance red-emitting luminescence . Nevertheless, neither the synthesis nor the UC characteristics of BYVO:Er 3+ /Yb 3+ crystals were comprehensively investigated.…”

Novel Red‐Emitting Gd3BW1‐xMoxO9 : Eu3+ Phosphor with High Thermal Stability for Application in UV‐Excited WLEDs and Rapid Visualization of Latent Fingerprints

“…The other method for producing WLEDs is through the combination of an ultraviolet (UV) LED chip with multiphased phosphors emitting blue, green, and red light, which has been considered as an effective method to produce warm white light with high color rendering index and low correlated color temperature. [15][16][17] Nevertheless, finding a suitable red-emitting phosphor for trichromatic WLEDs is quite difficult, in consideration of the commercial red-emitting Y 2 O 2 S : Eu 3 + phosphors have a fatal defect in terms of poor thermal stability under UV radiation. [18] For other commercial red phosphors, like Eu 2 + or Ce 3 + ion doped nitrides, Mn 4 + ion doped oxides and fluorides, [19][20][21][22] however, their drawbacks are also apparent mainly due to the extremely harsh reaction conditions such as high temperature and high pressure (typically prepared under 1800 °C, 0.5 MPa N 2 pressure), leading to a high investment and energy costs.…”

“…Inspite of its wide applications and high luminous efficacy, the major shortcoming of this method is that it is restricted to a high correlated color temperature (CCT>6000 K) and low color rendering index (Ra<70) because of the lack of the red spectral contribution in the visible region, [11–14] which limits its widespread commercialization in the lighting market. The other method for producing WLEDs is through the combination of an ultraviolet (UV) LED chip with multiphased phosphors emitting blue, green, and red light, which has been considered as an effective method to produce warm white light with high color rendering index and low correlated color temperature [15–17] . Nevertheless, finding a suitable red‐emitting phosphor for trichromatic WLEDs is quite difficult, in consideration of the commercial red‐emitting Y 2 O 2 S : Eu 3+ phosphors have a fatal defect in terms of poor thermal stability under UV radiation [18] .…”