Synthesis and optical properties of far-red dual perovskite Sr2InTaO6: Mn4+ phosphors for indoor plant lighting LED

Thermally stable rare-earth-free double perovskite phosphors toward dual-mode optical thermometry and dual-functional lighting sources

“…The internal QY of phosphor SLSO: 0.3%Mn 4+ was measured to be about 29.05%, as shown in Fig. 4(c), which is superior to that of numerous Mn 4+ -doped red phosphors, such as Sr 2 InTaO 6 :Mn 4+ (QY = 11%), 41 Ca 2 YNbO 6 :Mn 4+ (QY = 23.1%), 42 and Ca 2 InSbO 6 :Mn 4+ , Li + (QY = 9.69%), 43 Ca 2 InSbO 6 : Mn 4+ (QY = 18.01%), 44 and SrLaGa 3 O 7 :Mn 4+ (QY = 13.83%). 45 Importantly, the absorption spectra of plant pigments, which play a vital role in plant metabolism, show a large overlap with the emission peak of the synthesized SLSO: 0.3%Mn 4+ phosphors, as exhibited in Fig.…”

“…The internal QY of phosphor SLSO: 0.3%Mn 4+ was measured to be about 29.05%, as shown in Fig. 4(c), which is superior to that of numerous Mn 4+ -doped red phosphors, such as Sr 2 InTaO 6 :Mn 4+ (QY = 11%), 41 Ca 2 YNbO 6 :Mn 4+ (QY = 23.1%), 42 and Ca 2 InSbO 6 :Mn 4+ , Li + (QY = 9.69%), 43 Ca 2 InSbO 6 :Mn 4+ (QY = 18.01%), 44 and SrLaGa 3 O 7 :Mn 4+ (QY = 13.83%). 45…”

An efficient rare-earth free deep red-emitting GdGeSbO6:Mn4+ phosphor for white light-emitting diodes

“…[18][19][20][21][22] Against this background, Mn 4+ -doped oxide phosphors have become the focus of research on new deep red phosphors due to their advantages of low cost of development and ease of synthesis, as well as good luminescence properties. [23][24][25][26][27] The 3d 3 electronic configuration of Mn 4+ ions replaced Al 3+ , Si 4+ , Ge 4+ , Nb 5+ , Sb 5+ , Ta 5+ , W 6+ , and Mo 6+ in the octahedral crystal structure with the splitting of its electronic shell layer into triple-simple t 2g and double-simple states, resulting in three outermost electrons occupying the lowerenergy t 2g orbitals, stabilizing the Mn 4+ ions at the lowest energy level and producing the typical 2 E g → 4 A 2g transition, 28,29 which gives rise to emission spectra in the 620-780 nm region. [30][31][32] Huang 33 has prepared Li 3 La 3 W 2 O 12 : Mn 4+ (∼719 nm) 34 and Ca 3 Al 4 ZnO 10 :Mn 4+ ,Mg 2+ (∼714 nm) phosphors, which exhibit high IQE, but their thermal stability is suboptimal; conversely, Hu has developed Li 2 MgTi 3 O 8 :Mn 4+ (∼680 nm) 35 and Li 2 Mg 3 TiO 6 :Mn 4+ (∼675 nm) 36 that exhibit better thermal stability but lower IQE.…”

Deep-red-emitting phosphors of Mn4+-activated tantalite for high-sensitivity lifetime thermometry and security films

“…To date, tetravalent manganese (Mn 4+ ) ions-doped materials with specific 3d 3 electron structures, which were found to give a strong deep-red emission under a broad excitation band, have attracted much attention for application in various advanced fields, such as WLEDs, fingerprint detection, plant cultivation, wide-gamut displays, luminescent thermometers, and flexible anti-counterfeiting films. [14][15][16][17][18][19][20][21][22][23][24] In particular, inorganic double-perovskite materials with octahedral sites are considered to be beneficial for the splitting of the Mn 4+ crystal field to obtain candidates with excellent lumines-cent performances, such as Gd 2 MgTiO 6 :Bi 3+ /Mn 4+ , 25 Y 2 MgTiO 6 :Mn 4+ , 26 La 3 Li 3 W 2 O 12 :Eu 3+ /Mn 4+ , 27 Ba 2 CaWO 6 : Mn 4+ , 28 La 2 ZnTiO 6 :Mn 4+ , 29 and (Ca,Sr,Ba) 2 CaWO 6 :Mn 4+ phosphors. 30 Herein, the double-perovskite structures with octahedral sites cooperating with Mn 4+ are shown to be an effective strategy for developing high-performance phosphors.…”

“…For example, Cao et al reported the Sr 2 InTaO 6 :Mn 4+ phosphors for use in indoor plant lighting LEDs. 24 However, when considering the poor thermal stability, it is suggested that the Sr 2 InTaO 6 :Mn 4+ phosphors might be not suitable for solid-state lighting. In addition, the Mn 4+ -doped phosphors also have afterglow properties.…”