Enhancing quantum efficiency and tuning photoluminescence properties in far-red-emitting phosphor Ca14Ga10Zn6O35:Mn4+ based on chemical unit engineering

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

“…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 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.…”

“…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. In the PL spectrum, there are five emission peaks centered at 680, 690, 700, 710, and 720 nm.…”

Tunable dual‐mode emission with excellent thermal stability in Ca4ZrGe3O12:Eu phosphors prepared in air for NUV‐LEDs

“…It is significant that luminescent intensity of CZGO:0.16Eu at 423 K (150°C) still maintains as much as 91.01% of that measured at room temperature upon 370 nm light irradiation. These results suggest that the as‐prepared phosphors display highly thermal stability, which is superior to that of most reported single‐phased phosphors for UV‐LEDs . The activation energy ( E a ) for thermal quenching of emission of CZGO:0.16Eu can be calculated via Arrhenian Equations,where I 0 and I(T) represent the luminescent intensities at room temperature and different temperatures, respectively.…”

“…These results suggest that the as-prepared phosphors display highly thermal stability, which is superior to that of most reported single-phased phosphors for UV-LEDs. [37][38][39][40][41] The activation energy (E a ) for thermal quenching of emission of CZGO:0.16Eu can be calculated via Arrhenian Equations 31,42 , where I 0 and I(T) represent the luminescent intensities at room temperature and different temperatures, respectively. C corresponds to a constant, while k stands for the Boltzmann constant (8.625 × 10 −5 eV/K).…”

Eco-friendly Mn-doped CsPbCl3 Perovskite Nanocrystals Glass with Blue-red Emitting for Indoor Plant Lighting

“…However, the current research was mainly focused on the phosphors with red/far red emission [3,9,10], and there are few studies and reports on blue-red emission. A highly e cient and dual-color emitting light convertor was reported by Lei et al [11], in which CaAlSiN 3 :Eu 2+ and BaMgAl 10 O 17 :Eu 2+ provide red and blue emission, respectively.…”