Luminescence dynamics of Eu3+ activated and co-activated defect spinel zinc titanate nanophosphor for applications in WLEDs

Cool green-emissive Y2Si2O7:Tb3+ nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications

“…Additionally, the absorption peaks attributed to the f-f transitions of Tb 3+ are observed in the longer wavelength spectral region, specically at 325 nm ( 7 F 6 / 5 H 7 ), 367 nm ( 7 F 6 / 5 L 9 ) and 487 nm ( 7 F 6 / 5 D 4 ). To explore the impact of Tb 3+ doping on the band gap (E g ) of the YPS host, the sample's acquired DRS data were transformed into optical absorption data employing the Kubelka-Munk formula illustrated in eqn (11). 49 The symbols for the reection coefficient, scattering coefficient, and molar absorption coefficient are K, S, and R, respectively.…”

“…Band gap energy will be conceivable from eqn (11) and ( 12), which utilised formula (13). 50 [F(R)hv] = C 2 (hn − E g ) 1/2 (13)…”

“…[5][6][7][8] In the present day, WLEDs have found extensive applications across diverse elds including optical waveguides, backlighting, sensors, automobile headlights, ashlights, solid-state lasers, and common lighting. [9][10][11][12][13] Generally, commercial wLEDs are typically produced by coalescing blue-emanating InGaN-chips with yellow-emitting Y 3 Al 5 O 12 :Ce 3+ nanophosphors. 14,15 However, these WLEDs oen lack a red module in the visible range, resulting in a white emission with a subpar color-renderingindex and high correlated-color-temperature.…”

Structural, optical, and luminescence properties of Dy3+‐activated potassium calcium silicate phosphor for white light‐emitting diodes

“…Most currently available white LEDs (w‐LEDs) use a blue‐emitting (450–470 nm) diode, which activates a Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce) phosphor and causes it to generate yellow light. However, the lack of the red component in this method results in a low and high colour rendering index (CRI) and colour‐correlated temperature (CCT) values, respectively, in the light that is produced [4]. A common technique for producing white light is to coat an n‐UV LED chip with red, green, and blue (RGB) phosphors.…”

Terahertz and UV–VIS Spectroscopy Evaluation of Copper Doped Zinc Magnesium Titanate Nanoceramics Prepared via Sol-Gel Method

“…12,13 Great efforts have been made to synthesize and investigate titanate materials such as A 2 TiO 4 (A = Al, Mg, Mn, Zn). [14][15][16] Zinc titanate (Zn 2 TiO 4 ), an important inverse spinel material with a wide bandgap of 3.1 eV, 17 has become a very practical electronic and bio-optic material with unique physical and chemical properties 18 due to the nature of the chemical bond between Zn 2+ , Ti 4+, and O 2− ions in Zn 2 TiO 4 . 19 It is therefore widely used in various areas such as gas sensors, healthcare, UV detectors, solar cells, photocatalysts, biosensors, and capacitors.…”