Structure analysis, tuning photoluminescence and enhancing thermal stability on Mn4+-doped La2-xYxMgTiO6 red phosphor for agricultural lighting

Abstract

Currently, phosphor-converted LED (pc-LEDs) are revolutionizing the industry of plant growth lighting. To meet the requirements of this technology, phosphors with tunable photoluminescence, high thermal stability and quantum efficiency are required. Herein, we found that the simple substitution of yttrium for lanthanum in La2MgTiO6:Mn4+ system could satisfy above three criteria simultaneously. The photoluminescence properties can be regulated by continuously controlling the chemical composition of La2-xYxMgTiO6:Mn4+ solid solution. The La sites are occupied by Y ions, causing a significant blue shift in the emission spectra which owing to the change of local crystal field strengthen. Meanwhile, the thermal stability and decay lifetimes are also varied due to the variation of band gap energy. Besides, luminous intensity, thermal stability and internal quantum efficiency (IQE) increased by 201.8%, 26%, and 23%, respectively. The electronic luminescence (EL) of pc-LED devices using La2-xYxMgTiO6:Mn4+ red phosphor is evaluated, which matching the absorption regions of plant pigments well, reflecting the superiority of the studied phosphors in plant growth lighting areas.

Tuning the luminescence properties of blue and far‐red dual emitting Gd2MgTiO6: Bi3+, Cr3+ phosphor for LED plant lamp

“…In band B, the absorption intensity of GMTO, GMTO: Bi 3+ , and GMTO: Cr 3+ is weaker than GMTO: Cr 3+ , Bi 3+ . In order to explore the effect of doping Bi 3+ and Cr 3+ , the band gaps of these materials were calculated by following formula 17 :…”

“…The calculations are shown in Figure 7A-D and the emission intensities at 150°C was maintained at 65.7% and A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref. [ proaches used in the above work general ing the flow of a high viscosity resin thr and modeling the chemical reactions and during processing.…”

“…It is known that the exchange interaction occurred when the (4) (ahv) 2 A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

“…It is reported that the double perovskite structure materials have tetrakaidecahedron and stable hexacoordinate octahedron structures, which can offer occupied lattices for different activators. 16,17 For instance, Ba 2 YSbO 6 : Eu 3+ phosphor exhibited red emission at 612 nm and LaMg 0.402 Nb 0.598 O 3 : Pr 3+ phosphor emitted blue, green, and red emission. 18,19 Xu et al reported a series of Ba 2 ScMO 6 :Dy 3+ phosphors that emitted two prominent peaks located at 493 nm ( 4 F 9/2 → 6 H 15/2 transition) and 583 nm ( 4 F 9/2 → 6 H 13/2 transition).…”

Exploration of the Temperature Sensing Ability of La2MgTiO6:Er3+ Double Perovskites Using Thermally Coupled and Uncoupled Energy Levels

“…Erbium ions have been widely applied in eye-safe lasers, optical communications, or lighting owing to their broad spectral range spans in the ultraviolet, visible, and near-infrared regions [ 4 , 5 , 6 ]. The most universal approach for LMT is a white-light conversion material related to emission from Sm 3+ and Eu 3+ [ 7 ], Mn 4+ and Yb 3+ [ 8 ], Bi 3+ [ 9 ], Eu 3+ [ 10 ], Eu 2+ [ 11 ], Mn 4+ [ 12 , 13 , 14 , 15 ], and Gd 3+ , Bi 3+ , Sm 3+ , and Eu 3+ ions [ 16 ]. Furthermore, an ample potential for optical thermal sensing has recently been demonstrated through these studies including LMT:Pr 3+ [ 17 ], LMT:Eu 3+ [ 3 ], and LMT:Nd 3+ [ 2 ].…”