Synthesis and optimization of photoluminescence properties in potential reddish orange emitting niobate phosphor for photonic device applications

Abstract

A series of samarium ions (Sm3+) activated barium sodium niobate (Ba2NaNb5O15) samples have been successfully synthesized via employing a solid‐state reaction technique. Single phase, crystalline tetragonal Ba2NaNb5O15 were formed and the crystallite size of the prepared sample varied with doping of Sm3+ ions. The scanning electron microscopy (SEM) images of Ba2NaNb5O15:Sm3+ illustrate that the particles possess a non‐uniform spherical structure with some agglomeration. The prepared Ba2NaNb5O15:Sm3+ phosphors were efficiently excited with near‐ultraviolet (n‐UV) (406 nm) and emit strong visible emission peaks in the range 550–725 nm. The phenomenon of concentration quenching was detected after x = 0.10 mol of Sm3+ ions concentration for Ba2NaNb5O15, which arises due to non‐radiative energy transfer through dipole–dipole interaction among activator ions. Colour coordinates (0.586, 0.412) for the optimized phosphor lies in the visible reddish orange region. A bi‐exponential decay behaviour was observed for the photoluminescence decay curve of the optimized phosphor sample with an average decay time in milliseconds. The temperature dependent emission intensity confirms that the Ba2−xNaNb5O15:xSm3+ (x = 0.10 mol) phosphor exhibits adequate thermal stability having high value of activation energy (ΔE = 0.201 eV). The comprehensive study and analysis of the as‐prepared samples suggest that the intense reddish orange emitting thermally stable Ba2NaNb5O15:Sm3+ phosphor can act as a potential luminescent material in phosphor coated lighting, solar cells and other photonic devices.

Structural and photoluminescent features of Eu3+ activated single‐phase niobate phosphor for lighting applications

“…PL lifetime was recorded for BNNO: x Eu 3+ ( x = 10.0 mol%) phosphor at λ ex = 463 and λ em = 615 nm for the transitions from 5 D 0 → levels of Eu 3+ ions as presented in Figure 7. The obtained lifetime curve was exponential in nature and well‐fitted bi‐exponential equation as follows 15 : $$$$\begin{equation*}I\;\left( t \right) = {I_0}\; + {A_{1\;}}{\mathrm{exp}}\left( { - \frac{t}{{{\tau _1}}}} \right) + {A_2}\;{\mathrm{exp}}\left( { - \frac{t}{{{\tau _2}}}} \right)\end{equation*}$$$$where $$I( t )$$ and I 0 signify the intensity at t and 0 s. τ 1 and τ 2 define the two decay lifetimes. A 1 and A 2 are the constants.…”

“…Alkaline earth niobate has high chemical and thermal stability, good electro‐optic, pyroelectric, piezoelectric, and nonlinear properties thus they have used in various applications 11–13 . So far, numerous transition metal, RE‐activated niobates, such as KLaNb 2 O 7 , LnNbO 4 (Ln = La, Y, and Ga), BaNb 2 O 6 , and other niobate‐based materials, have shown magnificent optical properties, which can be broadly considered for the utility in photocatalysis, lasers, optical data storage, optical switching, and so on 14–17 …”

“…[11][12][13] So far, numerous transition metal, REactivated niobates, such as KLaNb 2 O 7 , LnNbO 4 (Ln = La, Y, and Ga), BaNb 2 O 6 , and other niobate-based materials, have shown magnificent optical properties, which can be broadly considered for the utility in photocatalysis, lasers, optical data storage, optical switching, and so on. [14][15][16][17] In the present work, a set of Eu 3+ -doped Ba 2 NaNb 5 O 15 phosphors were prepared through high-temperature solidstate reaction (SSR) route. In this, the structural, morphological, and spectroscopic properties of the as-prepared phosphors have been studied.…”

Lumino-structural properties of Dy3+ activated Na3Ba2LaNb10O30 phosphors with enhanced internal quantum yield for w-LEDs

“… 25 The general practice to prepare niobate-based phosphors is the solid state reaction method, which has the benefit of producing samples with excellent morphology and luminosity, over other methods. 26 …”

“…25 The general practice to prepare niobate-based phosphors is the solid state reaction method, which has the benet of producing samples with excellent morphology and luminosity, over other methods. 26 In search of a suitable host lattice, scientists have been conducting research in order to prepare phosphor-converted white light emitting diode (pc-wled). 27 In our present study, we focus towards the generation of white light from dysprosium doped Na 3 Ba 2 LaNb 10 O 30 phosphors via solid state reaction technique.…”