Characteristic white light emission via down-conversion SrGdAlO4:Dy3+ nanophosphor

Hooda, Anju; Khatkar, S.P.; Khatkar, Avni; Chahar, Sangeeta; Devi, Sushma; Dalal, Jyoti; Taxak, V.B.

doi:10.1016/j.cap.2019.03.005

Cited by 43 publications

(6 citation statements)

References 29 publications

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“…The SrGdAlO 4 compound crystallizes in a tetragonal structure with the space group I4/mmm (a = b = 0.3663 nm, c = 1.1998 nm, a = b = g = 901). [31][32][33][34][35][36][37] In this host material, Sr 2+ and Gd 3+ are nine-fold coordinated, whereas Al 3+ ions are surrounded by six oxygen atoms forming (AlO 6 ) 9À octahedrons (Fig. 1a).…”

Section: Resultsmentioning

confidence: 99%

Temperature invariant lifetime based luminescent manometer on Mn⁴⁺ ions

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Temperature invariant lifetime based luminescent manometer on Mn⁴⁺ ions

et al. 2023

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“…Initially, PL intensity increases with an increase in the concentration of Dy 3+ ions up to 0.03 mol which is known as the optimum concentration, and then the intensity falls gradually with further increase in the concentration of dopant ions due to the concentration quenching phenomenon. The main factor responsible for the concentration quenching phenomenon is generally the non-radiative energy transfer occurring between the neighboring dopant ions which are ascribed to be radiative reabsorption, exchange interaction, or multipole-multipole interaction [37,43]. The exact mechanism responsible for the quenching behavior is determined by calculating the critical (energy transfer) distance Rc making use of the Blasse equation which is given below [36,44]:…”

Section: Concentration Quenchingmentioning

confidence: 99%

“…4. The strain (ε) and dislocation density (δ) are also determined for all the synthesized nanophosphors using the following equations, respectively [36,37]:…”

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confidence: 99%

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Dahiya

Kumar

2021

J Mater Sci: Mater Electron

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A series of novel single-phase white light-emitting Dy 3+ doped Ca9Al(PO4)7 nanophosphors was successfully synthesized at 1100 ˚C via solution combustion route. X-ray diffraction (XRD) and Rietveld refinement analysis of Ca9Dy0.03Al0.97(PO4)7 sample confirmed that this phosphor had a trigonal crystal structure with space group R3c(161). Meanwhile, as-observed from the transmission electron microscopy (TEM) study; particles of Ca9DyxAl(1-x)(PO4)7 samples were found to have a quadrilateral shape with crystallite sizes around 40-60 nm which were also confirmed by the Debye Scherrer equation. Under near-ultraviolet (NUV) excitation at 350 nm, photoluminescence (PL) emission spectra of nanocrystalline Ca9Al(PO4)7: Dy 3+ phosphors showed two peaks at 481 nm and 572 nm corresponding to 4 F9/2→ 6 H15/2 and 4 F9/2→ 6 H13/2 transitions, respectively. The optimum concentration was found to be x = 0.03 mol. The critical energy transfer distance was calculated to be 20 and further Huang analysis concluded the exact mechanism i.e. dipole-dipole interactions responsible for concentration quenching in Ca9DyxAl(1-x)(PO4)7 samples. Furthermore, the Commission Internationale de I'Eclairage (CIE) chromaticity coordinates of Ca9Dy0.03Al0.97(PO4)7 nanophosphor was calculated to be (0.260, 0.297) and this nanophosphor had correlated color temperature (CCT) of 11332 K which is located in a cool white area. Existing results indicate that Ca9Dy0.03Al0.97(PO4)7 nanophosphor may be considered as a favorable candidate in NUV based single-phase cool White light-emitting diodes (WLEDs).

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“…The R of all Mg 2 InSbO 6 :xSm 3+ (0.01 ≤ x ≤ 0.30) phosphors is greater than 1, which further explains Sm 3+ ion occupied in the non-center symmetry in Mg 2 InSbO 6 host lattice. 40…”

Section: Optical Propertiesmentioning

confidence: 99%

Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

et al. 2021

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In this study, Sm 3+ -doped double-perovskite Mg 2 InSbO 6 phosphors were synthesized via high-temperature solid-state reaction. Mg 2 InSbO 6 belongs to the doubleperovskite family with a space group of R3 (No.148). The photoluminescence (PL) spectrum illustrates that Mg 2 InSbO 6 :0.05Sm 3+ phosphor can emit intense orange-red emission light at 607 nm due to the 4 G 5/2 → 6 H 7/2 transition. The optimum concentration of Mg 2 InSbO 6 :xSm 3+ is confirmed to 0.05 mol. The asymmetric ratio ( 4 G 5/2 → 6 H 9/2 / 4 G 5/2 → 6 H 5/2 ) of Mg 2 InSbO 6 :0.05Sm 3+ phosphor is 2.73. The quenching temperature exceeds 500 K, illustrating that Mg 2 InSbO 6 :Sm 3+ sample has excellent heat resistance. The high color purity and correlated color temperature (CCT) of Mg 2 InSbO 6 :Sm 3+ phosphors are obtained. Furthermore, a white light-emitting diode (w-LED) is successfully fabricated, possessing CCT of 6769 K and high color rendering index (R a ) of 89. Therefore, the orange-red-emitting Mg 2 InSbO 6 :Sm 3+ phosphors exhibit great potential to apply in solid-state lighting fields. K E Y W O R D S LED, luminescence, Mg 2 InSbO 6 :Sm 3+ , phosphor | 5967 LIU et aL. | INTRODUCTIONw-LEDs show a high potential application in displays and lighting. In addition, w-LEDs are replacing conventional solid-state lighting sources (fluorescent, incandescent, and metal-halide lamps), which are based on admirable merits, like high efficiency, energy conservation, long lifetimes, and eco-friendliness. [1][2][3][4] Currently, the method to fabricate commercial w-LEDs is a combination of yellow phosphor Y 3 Al 5 O 12 :Ce 3+ (YAG) and a blue LED chip. However, these products show high CCT and poor R a , owing to the lack of red composition. 5,6 These inevitable disadvantages greatly limit their application and popularization. An alternative way is developed using trichromatic (green, blue, and red) phosphors coated on the near-ultraviolet (n-UV) chips, which have recently received increasing attention. 7 Nitride is regarded as an excellent red phosphor like SrLiAl 3 N 4 :Ce 3+ , Sr 2 [BeAl 3 N 5 ]:Eu 2+ , and CaAlSiN 3 :Eu 2+ . 8-10 However, the synthesis condition (high temperature and high pressure) is strict. 11,12 Hence, exploring new orange-red-emitting or redemitting phosphors with good luminescence properties is extremely urgent. 13 Sm 3+ with 4f 5 electronic configuration is an important activator ion among the lanthanoid ions. [14][15][16] Sm 3+ usually exhibits orange-red or red emission in the visible region while excited by n-UV or blue light, which attributes to the 4 G 5/2 → 6 H 7/2 or 4 G 5/2 → 6 H 9/2 transitions, respectively. 17,18

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Characteristic white light emission via down-conversion SrGdAlO4:Dy3+ nanophosphor

Cited by 43 publications

References 29 publications

Temperature invariant lifetime based luminescent manometer on Mn⁴⁺ ions

Temperature invariant lifetime based luminescent manometer on Mn⁴⁺ ions

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

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Characteristic white light emission via down-conversion SrGdAlO4:Dy3+ nanophosphor

Cited by 43 publications

References 29 publications

Temperature invariant lifetime based luminescent manometer on Mn4+ ions

Temperature invariant lifetime based luminescent manometer on Mn4+ ions

Single phase cool white light emitting novel Ca9Al(PO4)7:Dy3+ nanophosphor under NUV excitation

Novel double‐perovskite Mg2InSbO6:Sm3+ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs

Contact Info

Product

Resources

About

Temperature invariant lifetime based luminescent manometer on Mn⁴⁺ ions

Temperature invariant lifetime based luminescent manometer on Mn⁴⁺ ions

Novel double‐perovskite Mg₂InSbO₆:Sm³⁺ phosphor with excellent heat‐resistant performance and high color purity used in white LEDs