2017
DOI: 10.3390/ma10111322
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Co-Precipitation Synthesis and Optical Properties of Mn4+-Doped Hexafluoroaluminate w-LED Phosphors

Abstract: Mn4+-activated hexafluoroaluminates are promising red-emitting phosphors for white light emitting diodes (w-LEDs). Here, we report the synthesis of Na3AlF6:Mn4+, K3AlF6:Mn4+ and K2NaAlF6:Mn4+ phosphors through a simple two-step co-precipitation method. Highly monodisperse large (~20 μm) smoothed-octahedron shaped crystallites are obtained for K2NaAlF6:Mn4+. The large size, regular shape and small size distribution are favorable for application in w-LEDs. All Mn4+-doped hexafluoroaluminates show bright red Mn4+… Show more

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Cited by 31 publications
(10 citation statements)
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“…These results indicate excellent emission and phase stability of the Mn 4+ -doped NCs over time, which is higher than that of other red-emitting NCs, such as InP and CsPbI 3 QDs. Moreover, we tested the thermal stability of the NC films by measuring their temperature-dependent PL spectra between 100 and 475 K (Figure S21–S22). The luminescence quenching temperature T 1/2 , defined as the temperature at which the PL intensity reaches half of its initial value (at 300 K), is around 475 K for Cs 2 SiF 6 :Mn 4+ and Cs 2 SnF 6 :Mn 4+ NCs and about 445 K for K 3 AlF 6 :Mn 4+ NCs, which are close to the values derived for the bulk phosphors . These quenching temperatures for Mn 4+ -doped NCs are above the phosphor processing and operating temperature of high-power wLEDs, which is about 423 K (150 °C), thus demonstrating the great promise of these NCs in LED and related applications. ,, …”
Section: Resultssupporting
confidence: 79%
See 1 more Smart Citation
“…These results indicate excellent emission and phase stability of the Mn 4+ -doped NCs over time, which is higher than that of other red-emitting NCs, such as InP and CsPbI 3 QDs. Moreover, we tested the thermal stability of the NC films by measuring their temperature-dependent PL spectra between 100 and 475 K (Figure S21–S22). The luminescence quenching temperature T 1/2 , defined as the temperature at which the PL intensity reaches half of its initial value (at 300 K), is around 475 K for Cs 2 SiF 6 :Mn 4+ and Cs 2 SnF 6 :Mn 4+ NCs and about 445 K for K 3 AlF 6 :Mn 4+ NCs, which are close to the values derived for the bulk phosphors . These quenching temperatures for Mn 4+ -doped NCs are above the phosphor processing and operating temperature of high-power wLEDs, which is about 423 K (150 °C), thus demonstrating the great promise of these NCs in LED and related applications. ,, …”
Section: Resultssupporting
confidence: 79%
“…The luminescence quenching temperature T 1/2 , defined as the temperature at which the PL intensity reaches half of its initial value (at 300 K), is around 475 K for Cs 2 SiF 6 :Mn 4+ and Cs 2 SnF 6 :Mn 4+ NCs and about 445 K for K 3 AlF 6 :Mn 4+ NCs, which are close to the values derived for the bulk phosphors. 42 These quenching temperatures for Mn 4+ -doped NCs are above the phosphor processing and operating temperature of high-power wLEDs, which is about 423 K (150 °C), thus demonstrating the great promise of these NCs in LED and related applications. 4,5,29 X-ray Scintillation Applications of Mn 4+ -Doped Fluoride NCs.…”
Section: Synthesis Of Mn 4+ -Doped Fluoride Ncs and Theirmentioning
confidence: 96%
“…The charge compensation phenomena were observed in the LiAl(PO 3 ) 4 :Tb 3+ –Eu 3+ host lattice as rare earth ions (Tb 3+ /Eu 3+ ) doped into the LiAl(PO 3 ) 4 phosphor. As per the Kröger–Vink notation, 69 the charge compensation is required for sites.The proximity of charge compensating defects (almost certainly vacancies or interstitials) gives rise to local deformation of the EuO 4 tetragonal and lifts the inversion symmetry and the charge compensation phenomena that occurred here. The PL emission spectra of Tb 3+ , Eu 3+ co-activated LiAl(PO 3 ) 4 phosphors doped with Na + and K + as charge compensators are shown in Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The emission spectrum consists of several sharp emission peaks at around ∼626 nm, corresponding to the spin-forbidden 2 Eg → 4 A2 transitions of Mn 4+ . That is, emission peaks at 596, 605, 610, 618, 626.5, 630.5, and 643.5 nm are attributed to the anti-Stokes ν3(t1u), ν4(t1u), and ν6(t2u), zero phonon line (ZPL), Stokes ν6(t2u), ν4(t1u), and ν3(t1u) vibrionic modes, respectively [24,25]. In this work, the ZPL peak is stronger compared to previously observed Mn 4+ activated fluoride such as K2(Si,Ge,Ti)F6 due to the relatively lower symmetry of the substituted distorted octahedral Al 3+ site in α-K3AlF6 [27].…”
Section: Resultsmentioning
confidence: 99%
“…K3AlF6 has been reported as a better thermal, chemical stability, melting point and lower water solubility than K2SiF6 [20][21][22][23]. Red emitting phosphor K3AlF6:Mn 4+ presented excellent luminescence performances [24,25]. However, the phosphor suffers from luminescence degradation in high moisture environment.…”
Section: Introductionmentioning
confidence: 99%