Red and blue emitting borate phosphor excited by near Ultraviolet Light

Bajaj, N. S.; Koparkar, K. A.; Nagpure, Pankaj A.; Omanwar, S. K.

doi:10.1007/s12596-016-0344-3

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…The reddish-orange emission has been obtained from the Sm 3+ doped YAl 3 (BO 3 ) 4 polycrystalline samples under near UV excitation [26]. The intense blue luminescence under UV excitation is observed in the Tm 3+ doped YAl 3 (BO 3 ) 4 samples [27].…”

Section: Introductionmentioning

confidence: 93%

Structural, Electronic and Vibrational Properties of YAl3(BO3)4

et al. 2020

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The crystal structure of YAl3(BO3)4 is obtained by Rietveld refinement analysis in the present study. The dynamical properties are studied both theoretically and experimentally. The experimental Raman and Infrared spectra are interpreted using the results of ab initio calculations within density functional theory. The phonon band gap in the Infrared spectrum is observed in both trigonal and hypothetical monoclinic structures of YAl3(BO3)4. The electronic band structure is studied theoretically, and the value of the band gap is obtained. It was found that the YAl3(BO3)4 is an indirect band gap dielectric material.

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Section: Introductionmentioning

confidence: 93%

Structural, Electronic and Vibrational Properties of YAl3(BO3)4

et al. 2020

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“…This property, together with high optical nonlinearity and excellent physical characteristics and chemical stability, make YAB extremely interesting for many applications. Doped with various rare-earth and transition metal ions, YAB crystals are well-known phosphors, promising for use as materials for display panels, lasers, scintillators, LEDs, luminescent thermometers, and in medical imaging [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. YAB crystals doped with Nd 3+ [ 8 , 13 ], Yb 3+ [ 11 , 12 , 14 ], Er 3+ /Yb 3+ [ 10 ], and Yb 3+ /Tm 3+ [ 16 ] are well-known media for self-frequency doubling, self-frequency summing, and up-conversion lasers.…”

Section: Introductionmentioning

confidence: 99%

Manganese Luminescent Centers of Different Valence in Yttrium Aluminum Borate Crystals

et al. 2023

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We present an extensive study of the luminescence characteristics of Mn impurity ions in a YAl3(BO3)4:Mn crystal, in combination with X-ray fluorescence analysis and determination of the valence state of Mn by XANES (X-ray absorption near-edge structure) spectroscopy. The valences of manganese Mn2+(d5) and Mn3+(d4) were determined by the XANES and high-resolution optical spectroscopy methods shown to be complementary. We observe the R1 and R2 luminescence and absorption lines characteristic of the 2E ↔ 4A2 transitions in d3 ions (such as Mn4+ and Cr3+) and show that they arise due to uncontrolled admixture of Cr3+ ions. A broad luminescent band in the green part of the spectrum is attributed to transitions in Mn2+. Narrow zero-phonon infrared luminescence lines near 1060 nm (9400 cm−1) and 760 nm (13,160 cm−1) are associated with spin-forbidden transitions in Mn3+: 1T2 → 3T1 (between excited triplets) and 1T2 → 5E (to the ground state). Spin-allowed 5T2 → 5E Mn3+ transitions show up as a broad band in the orange region of the spectrum. Using the data of optical spectroscopy and Tanabe–Sugano diagrams we estimated the crystal-field parameter Dq and Racah parameter B for Mn3+ in YAB:Mn as Dq = 1785 cm−1 and B = 800 cm−1. Our work can serve as a basis for further study of YAB:Mn for the purposes of luminescent thermometry, as well as other applications.

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“…Nowadays, the lighting industry favors phosphor-converted white light-emitting diodes (WLEDs) as one of the vital light sources because the WLEDs have outstanding features such as compactness, energy saving, low cost, and high chromatic stability [1]. Therefore, the application areas of WLEDs have spread over many different aspects in our life, for instance: landscape lighting, street lighting, backlighting, etc.…”

Section: Introductionmentioning

confidence: 99%

Building superior lighting properties for WLEDs utilizing two-layered remote phosphor configurations

Anh

Ngoc

2020

Materials Science-Poland

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The remote phosphor structure produces higher luminous flux but delivers poorer color quality than the conformal or in-cup phosphor structure. To eliminate this weakness, researchers have attempted to improve the chromatic properties of remote phosphor package. This study tends to enhance lighting features for WLEDs including color quality and luminous flux in general or color rendering index (CRI) and color quality scale (CQS) in particular by applying dual-layer remote phosphor structure. In the simulation section, we utilize two identical LEDs that only differ in correlated color temperature values which are 6600 K and 7700 K. The study offers an idea of placing a yellow-green phosphor layer SrBaSiO4:Eu2+ or a red phosphor layer SrwFxByOz:Eu2+,Sm2+ on the yellow phosphor layer YAG:Ce3+ and then modifying the concentrations of SrwFxByOz:Eu2+,Sm2+ and SrBaSiO4:Eu2+ to the suitable values to improve the color quality and lumen output of WLEDs. The results show that red phosphor layer SrwFxByOz:Eu2+,Sm2+ has a significant influence on CRI and CQS improvement. Particularly, the increase of SrwFxByOz:Eu2+,Sm2+ concentration leads to increased CRI and CQS because the red light component increases in WLEDs. On the other hand, the green phosphor layer SrBaSiO4:Eu2+ only brings benefit to the luminous flux. However, the WLEDs’ luminous flux and color quality drop sharply, when SrwFxByOz:Eu2+,Sm2+ and SrBaSiO4:Eu2+ concentrations rise extremely, which is verified based on the Mie-scattering theory and the Lambert-Beer law. In short, the article provides general knowledge and primary information for the production of higher-quality WLEDs.

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Red and blue emitting borate phosphor excited by near Ultraviolet Light

Cited by 7 publications

References 19 publications

Structural, Electronic and Vibrational Properties of YAl3(BO3)4

Structural, Electronic and Vibrational Properties of YAl3(BO3)4

Manganese Luminescent Centers of Different Valence in Yttrium Aluminum Borate Crystals

Building superior lighting properties for WLEDs utilizing two-layered remote phosphor configurations

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