Phosphors with high quantum efficiency and thermal stability are greatly desired for lighting industries. Based on the design strategy of solid solution, a series of deep-blue-emitting phosphors (Sr 0.99-x Ba x) 2 P 2 O 7 :0.02Eu 2+ (SB x PE x = 0-0.5) are developed. Upon excitation at 350 nm, the optimized SB 0.3 PE phosphor shows a relatively narrow full width at half maximum (FWHM = 32.7 nm) peaking at 420 nm, which matches well with the plant absorption in blue region. Moreover, this phosphor exhibits obvious enhancement of internal quantum efficiency (IQE) (from 74% to 100%) and thermal stability (from 88% to 108% of peak intensity and from 99% to 124% of integrated area intensity at 150 C) compared with the pristine one. The white LED devices using SB 0.3 PE as deep-blue-emitting component show good electronic properties, indicating that SB 0.3 PE is promising to be used in plant growth lighting, white LEDs, and other photoelectric applications.

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.

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