Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Haranath, D.; Mishra, Saroj Kumar; Yadav, Satyesh Kumar; Sharma, Ravi; Kandpal, Lalit Mohan; Vijayan, N.; Dalai, M. K.; Sehgal, G.; Shanker, Virendra

doi:10.1063/1.4768214

Cited by 60 publications

(30 citation statements)

References 23 publications

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“…Due to this, the design of rare-earth free materials is majorly needed. The rare-earth free phosphors can be understood with three main strategies: (i) use of transition metals for luminescent centers171819202122, (ii) use of defects such as oxygen vacancies23242526 and (iii) use of materials such as tungstates and vanadates27282930.…”

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confidence: 99%

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Bharat

Jeon²,

Krishna

et al. 2017

Sci Rep

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The commercially available white-light-emitting diodes (WLEDs) are made with a combination of blue LEDs and yellow phosphors. These types of WLEDs lack certain properties which make them meagerly applicable for general illumination and flat panel displays. The solution for such problem is to use near-ultraviolet (NUV) chips as an excitation source because of their high excitation efficiency and good spectral distribution. Therefore, there is an active search for new phosphor materials which can be effectively excited within the NUV wavelength range (350–420 nm). In this work, novel rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors were synthesized by a citrate assisted sol-gel method at low calcination temperatures. Optical properties, internal quantum efficiency and thermal stability as well as morphology and crystal structure of Ca2KZn2(VO4)3 phosphors for their application to NUV-based WLEDs were studied. The crystal structure and phase formation were confirmed with XRD patterns and Rietveld refinement. The optical properties of these phosphor materials which can change the NUV excitation into visible yellow-green emissions were studied. The synthesized phosphors were then coated onto the surface of a NUV chip along with a blue phosphor (LiCaPO4:Eu2+) to get brighter WLEDs with a color rendering index of 94.8 and a correlated color temperature of 8549 K.

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confidence: 99%

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Bharat

Jeon²,

Krishna

et al. 2017

Sci Rep

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“…525 nm with a broad band of 480–600 nm and a bandwidth at half maximum of about 36 nm . Mn 2+ is tetrahedrally coordinated, and the emission of green light is attributed to the spin‐forbidden d–d transition ( 4 T 1 → 6 A 1 ) of Mn 2+ ions . As the 3d–3d transition in Mn 2+ centres is parity forbidden and spin forbidden, its excitation intensity is not sufficiently high in the near‐UV or blue wavelength regions.…”

Section: Resultsmentioning

confidence: 99%

Novel pure Ca₂ZnMoO₆ composition with white‐light luminescence

Peng

Lin²,

Yang

et al. 2019

Luminescence

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Phosphors with composition Ca2ZnMoO6 were synthesized at temperatures of 800–1200°C using the solid‐state method. Analysis of X‐ray diffraction patterns of the Ca2ZnMoO6 powders did not reveal a double perovskite structure. When the synthesis temperature was equal to or higher than 800°C, the synthesized Ca2ZnMoO6 powders revealed a tetragonal structure (CaMoO4) rather than an orthorhombic structure (Ca2ZnMoO6) and the cubic structure (Sr2ZnMoO6) of a double perovskite. The ZnO phase was still observed at a synthesis temperature of 1200°C. The compositions of synthesized Ca2ZnMoO6 powders differed from the prepared powder, and the Ca2ZnMoO6 phosphors exhibited some important novel features. First, synthesized Ca2ZnMoO6 compositions could emit light as a phosphor no activators, called Ca2ZnMoO6 phosphors. Effect of synthesis temperature on luminescence properties of these Ca2ZnMoO6 phosphors was readily observed, and some important novel features and properties were noted. Second, the phosphors presented only one broad characteristic emission peak in the visible light region. Third, measurement of the chromaticity diagram of the Ca2ZnMoO6 phosphors revealed a white‐light source. Through analysis, we determined why the synthesized Ca2ZnMoO6 phosphors had just one broad characteristic emission peak.

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“…In particular, the nickel‐ or cobalt‐containing phosphates are perspective ionic conductors, catalysts in organic reactions, cathode materials in sodium‐ion batteries . Except that, the double phosphates M I M II PO 4 are perspective as sorbents or hosts for luminescent materials . They show the high thermal and chemical stability.…”

Section: Introductionmentioning

confidence: 99%

The double phosphates M^IM^IIPO₄ (M^I – Na, K; M^II – Mg, Mn, Co, Ni, Zn) – synthesis from chloride melts and characterization

Livitska

Strutynska

Zatovsky

et al. 2015

Crystal Research and Technology

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The particularities of the chemical interaction in systems MIPO3‐MIIO(or Mn2O3)‐MICl (MI – Na, K; MII – Mg, Co, Ni, Zn) have been investigated at the temperature 1073 K and molar ratios P/Mx = 1 or 2 and MICl/(MIPO3 + MIIO(or Mn2O3)) = 30. The conditions of formation of complex phosphates MІMIIPO4 and Na4Ni3(PO4)2P2O7 have been found. Influences of the nature of alkali and bivalent metals on the products composition were discussed. The advantages of chloride melts using (synthesis time reduction and temperature reducing) for preparing of complex phosphates were shown. The synthesized compounds have been characterized using the powder X‐ray diffraction, Fourier transform infrared and diffuse reflectance spectroscopies.

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Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Cited by 60 publications

References 23 publications

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Novel pure Ca₂ZnMoO₆ composition with white‐light luminescence

The double phosphates M^IM^IIPO₄ (M^I – Na, K; M^II – Mg, Mn, Co, Ni, Zn) – synthesis from chloride melts and characterization

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Rare-earth free yellow-green emitting NaZnPO4:Mn phosphor for lighting applications

Cited by 60 publications

References 23 publications

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Rare-earth free self-luminescent Ca2KZn2(VO4)3 phosphors for intense white light-emitting diodes

Novel pure Ca2ZnMoO6 composition with white‐light luminescence

The double phosphates MIMIIPO4 (MI – Na, K; MII – Mg, Mn, Co, Ni, Zn) – synthesis from chloride melts and characterization

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Product

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Novel pure Ca₂ZnMoO₆ composition with white‐light luminescence

The double phosphates M^IM^IIPO₄ (M^I – Na, K; M^II – Mg, Mn, Co, Ni, Zn) – synthesis from chloride melts and characterization