Enhanced photoluminescence and energy transfer performance of Y₃Al₄GaO₁₂:Mn⁴⁺,Dy³⁺ phosphors for plant growth LED lights

Abstract

Enhanced photoluminescence properties and confirmed energy transfer in a YAGO:Mn4+,Dy3+ phosphor.

Engineering cation vacancies to improve the luminescence properties of Ca14Al10Zn6O35: Mn4+ phosphors for LED plant lamp

“…The PLE spectrum shows a wide absorption band from 200 to 550 nm, which can be split into five peaks located at 312, 355, 397, 465, and 471 nm. The peak at 312 nm is assigned to the charge transfer band (CTB) of Mn 4+ ‐O 2− ; the peaks around 355 and 397 nm are ascribed to the Mn 4+ spin‐allowed transitions 4 A 2 → 4 T 1 and 4 A 2 → 2 T 2 respectively; while, the peaks at 465 and 471 nm are arisen from the 4 A 2 → 4 T 2 spin‐allowed transition of Mn 4+ . The PLE spectrum monitored at 715 nm demonstrates that the C 14− x AZ 6− y O: Mn 4+ phosphor can be excited by ultraviolet (UV), near ultraviolet (NUV) and blue LED chips .…”

“…The peak at 312 nm is assigned to the charge transfer band (CTB) of Mn 4+ -O 2− ; the peaks around 355 and 397 nm are ascribed to the Mn 4+ spin-allowed transitions 4 A 2 → 4 T 1 and 4 A 2 → 2 T 2 respectively; while, the peaks at 465 and 471 nm are arisen from the 4 A 2 → 4 T 2 spin-allowed transition of Mn 4+ . 37 The PLE spectrum monitored at 715 nm demonstrates that the C 14−x AZ 6−y O: Mn 4+ phosphor can be excited by ultraviolet (UV), near ultraviolet (NUV) and blue LED chips. 38 The PL spectrum excited by 470 nm has a wide band from 600 to 800 nm assigned to 2 E → 4 A 2 transition, which could meet the needs of plant growth and development.…”

Optical properties of the CaEuAl3O7 phosphor with dual‐activator Eu2+/Eu3+ for multifunctional applications

“…In the sample prepared in carbon rod reduction atmosphere (CRR), the broadband emission of Eu 2+ ions and the red emission of Eu 3+ ions can match well with the absorption of carotenoids and chlorophylls. Furthermore, the full‐width at half‐maximum FWHM of blue emission in the CRR sample is better than that of Dy 3+ and Eu 2+ ‐doped phosphors 34‐36 . On the other side, the temperature dependence of FIR is explored through monitoring the emissions of 5 d ‐4 f of Eu 2+ ions and 5 D 0 ‐ 7 F J ( J = 2, 4) of Eu 3+ ions, respectively.…”

“…Furthermore, the full-width at half-maximum FWHM of blue emission in the CRR sample is better than that of Dy 3+ and Eu 2+ -doped phosphors. [34][35][36] On the other side, the temperature dependence of FIR is explored through monitoring the emissions of 5d-4f of Eu 2+ ions and 5 D 0 -7 F J (J = 2, 4) of Eu 3+ ions, respectively. The maximum sensitivity calculated is as high as 6.90% K −1 .…”

Development of deep red–emitting CaBiVO5:Pr3+ phosphor for multifunctional optoelectronic applications

“…Besides this, pc-LED delivers numerous advantages over prevailing lighting sources (incandescent, metal halide, and high-pressure lamps) such as environmental protection, improved energy efficiency, smaller size, advanced control capabilities, longer service time, and reduced radiated heat. [10][11][12] In general, pc-LEDs fabricated by coupling with FR-emitting Mn 4+ -doped phosphors and other red phosphors may exhibit an emission overlapped with the absorption spectrum of phytochromes. Such fabricated pc-LEDs can aid to control the duration of sunlight sensed by plants, which can regulate the flowering time of plants.…”