Pr3+ doped BaNb2O6 reddish orange emitting phosphor for solid state lighting and optical thermometry applications

Jana, Subhajit; Mondal, Amba; Manam, J.; Das, Subhashish

doi:10.1016/j.jallcom.2019.153342

Cited by 91 publications

(30 citation statements)

References 70 publications

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“…These spectra reveal three adjacent excitation bands due to intra‐configurational Pr 3+ : 4f‐4f transitions and they have been ascribed to Pr 3+ : 3 H 4 → 3 P 2 (445 nm), Pr 3+ : 3 H 4 → 3 P 1 (471 nm) and Pr 3+ : 3 H 4 → 3 P 0 (483 nm) transitions. [ 42 ] The excitation spectra of SGPPr x phosphors match with those reported for BaNb 2 O 6 :Pr 3+[ 2 ] and PbGdB 7 O 13 :Pr 3+[ 43 ] phosphors. The excitation wavelengths corresponding to Pr 3+ : 3 H 4 → 3 P J = 2,1,0 transitions cover the emission wavelength range (440–490 nm) of commercial InGaN blue‐LED chip.…”

Section: Resultssupporting

confidence: 77%

“…These values are comparable to those reported for BaNb 2 O 6 :Pr 3+ phosphors for which the nephelauxetic ratio, bonding parameter and covalency were reported as 0.966, 0.130 and 0.035, respectively. [ 2 ]

Nephelauxetic ratio, β goodbreak= \frac{1}{n} \sum \frac{υ_{italiccomplex}}{υ_{free - ion}}

Bonding parameter, \overset{β}{true} goodbreak= \sqrt{\frac{1 - β}{2}}

Covalency, δ goodbreak= ((), \frac{1 - β}{β})

Section: Resultsmentioning

confidence: 99%

“…[ 2 ]

Nephelauxetic ratio, β goodbreak= \frac{1}{n} \sum \frac{υ_{italiccomplex}}{υ_{free - ion}}

Bonding parameter, \overset{β}{true} goodbreak= \sqrt{\frac{1 - β}{2}}

Covalency, δ goodbreak= ((), \frac{1 - β}{β})

In the case of Pr 3+ ions, the 4f → 4f emission transitions belonging to 3 P 1 , 3 P 0 and 1 D 2 energy states to their lower lying energy states are mostly influenced by the host matrix environment. Therefore, the Pr 3+ ions in different host matrices such as phosphors, crystals and glasses [ 2,46,47 ] exhibit luminescence mainly due to 3 P 1,0 , 1 D 2 emission states. The non‐radiative (NR) transitions between 3 P J = 1,0 and 1 D 2 energy states initiated by the host crystal field environment leads the quenching of luminescence of the transitions originated from 3 P J = 1,0 energy states and enhance the intensity of 1 D 2 → 3 H 4 transition.…”

Section: Resultsmentioning

confidence: 99%

“…

Colour purity goodbreak= \frac{\sqrt{{((), x goodbreak- x_{ee})}^{2} + {((), y goodbreak- y_{ee})}^{2}}}{\sqrt{{((), x_{d} goodbreak- x_{ee})}^{2} + {((), y_{d} goodbreak- y_{ee})}^{2}}} goodbreak\times 100

The coordinates corresponding to equal‐energy point and the dominant‐wavelength point are

((),, x_{ee} = 0.3333, y_{ee} = 0.3333)

and

((),, x_{d} = 0.6177, y_{d} = 0.3817)

, respectively. The CIE coordinates of SGPPr x phosphors are identical to that of other inorganic‐phosphors [ 2,43,49–52 ] and they are summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Tri-valent rare-earth (RE) ions that activate inorganic phosphors have been designed and developed for solid-state lighting (SSL) devices, optical sensors, radiation scintillators and lasers due to their good absorption of RE ions, excellent thermal behaviour, stable chemical properties and high energy conversion. [1][2][3][4] The tri-colour phosphors play a significant part in the development of phosphor convertedwhite-light-emitting diodes (PC-WLEDs) by overcoming the limitations such as low colour-rendering-index and high-colourtemperature. [5][6][7] The orthophosphate phosphors of composition A 3 M (PO 4 ) 3 (where A = Ca, Ba, Sr and M = Y, Gd, La, Lu) show excellent advances for various scientific and technological applications.…”

Section: Introductionmentioning

confidence: 99%

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Optical analysis of Sr₃Gd(PO₄)₃:Pr³⁺ phosphors for lighting applications

Khan

Jamalaiah²

2022

Luminescence

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A series of praseodymium (Pr3+) ion activated Sr3Gd(1−x)(PO4)3:xPr3+ (0 ≤ x ≤ 2.0 mol%) phosphors were prepared and their structural, compositional and luminescence properties were investigated. The X‐ray diffraction profiles indicate that the studied phosphors crystallized into body centred cubic structure and the Pr3+ ions have no influence on Sr3Gd(PO4)3 phase. The high‐resolution scanning electron microscopy images show the agglomeration of particles that are inter‐connected and form irregular shape Sr3Gd(PO4)3 structures. The excitation transitions corresponding to Pr3+:3H4 → 3P2,1,0 transitions at 445, 471 and 483 nm, respectively, matched well with the emission of blue‐light‐emitting diode (LED) chip. The emission spectra show strong reddish‐orange luminescence through 1D2 → 3H4 transition when excited at 445 nm blue wavelength. The synthesized phosphors have the potential to be used as reddish‐orange lighting devices.

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Section: Resultssupporting

confidence: 77%

Nephelauxetic ratio, β goodbreak= \frac{1}{n} \sum \frac{υ_{italiccomplex}}{υ_{free - ion}}

Bonding parameter, \overset{β}{true} goodbreak= \sqrt{\frac{1 - β}{2}}

Covalency, δ goodbreak= ((), \frac{1 - β}{β})

Section: Resultsmentioning

confidence: 99%

“…[ 2 ]

Nephelauxetic ratio, β goodbreak= \frac{1}{n} \sum \frac{υ_{italiccomplex}}{υ_{free - ion}}

Bonding parameter, \overset{β}{true} goodbreak= \sqrt{\frac{1 - β}{2}}

Covalency, δ goodbreak= ((), \frac{1 - β}{β})

Section: Resultsmentioning

confidence: 99%

“…

Colour purity goodbreak= \frac{\sqrt{{((), x goodbreak- x_{ee})}^{2} + {((), y goodbreak- y_{ee})}^{2}}}{\sqrt{{((), x_{d} goodbreak- x_{ee})}^{2} + {((), y_{d} goodbreak- y_{ee})}^{2}}} goodbreak\times 100

The coordinates corresponding to equal‐energy point and the dominant‐wavelength point are

((),, x_{ee} = 0.3333, y_{ee} = 0.3333)

and

((),, x_{d} = 0.6177, y_{d} = 0.3817)

, respectively. The CIE coordinates of SGPPr x phosphors are identical to that of other inorganic‐phosphors [ 2,43,49–52 ] and they are summarized in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optical analysis of Sr₃Gd(PO₄)₃:Pr³⁺ phosphors for lighting applications

Khan

Jamalaiah²

2022

Luminescence

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Enhanced red luminescence from GdAl₃(BO₃)₄: Pr³⁺ phosphors under NUV excitation

Jamalaiah,

Khan,

Madhu

2024

Luminescence

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The GdAl3(BO3)4:xPr3+ (0 ≤ x ≤ 5.0 mol%) phosphors were prepared through solid state reaction route and characterized for various lighting applications. Powder X‐ray diffraction investigations revel rhombohedral structure matched to JCPDS card no. 83‐1907. The morphological studies confirm the agglomeration of particles with different size and shape. The emission spectra show various emission transitions originating from Pr3+:(3P1,0, 1D2) emission states to their lower lying energy states upon 274 nm NUV excitation with a red shift for x > 0.5 mol%. The colour perception analysis results an intense red luminescence due to efficient energy transfer from Gd3+ to Pr3+ ions. The temperature‐dependent luminescence investigations show good thermal stability even beyond 150°C with an activation energy of 0.24 eV. The observed experimental results show the potentiality of GdAl3(BO3)4:0.5 Pr3+ phosphor for red emitting devices and red component in phosphor converted white LEDs.

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