Visible to NIR down-shifting and NIR to visible upconversion luminescence in Ca14Zn6Ga10O35:Mn4+, Ln3+ (Ln=Nd, Yb, Er)

Novel Intense Emission-Tunable Li1.5La1.5WO6:Mn4+,Nd3+,Yb3+ Material with Good Luminescence Thermal Stability for Potential Applications in c-Si Solar Cells and Plant-Cultivation Far-Red-NIR LEDs

“…However, both of their parity-forbidden 4f–4f transitions lead to the narrow and feeble excitation bands. Accordingly, it is necessary to select a suitable sensitizer with a broad absorption band for them, which may be accomplished with aforementioned Mn 4+ . Therefore, we can expect that a single-phase phosphor simultaneously comprising far-red and NIR bands would like to be acquired in some suitable systems for plant-cultivation application LEDs and c-Si solar cells.…”

Design of Ratiometric Dual‐Emitting Mechanoluminescence: Lanthanide/Transition‐Metal Combination Strategy

“…Actually, such obstacle can be circumvented by means of ratiometric detection schemes, as has been well demonstrated in optical thermometry where fluorescence intensity ratio (FIR) techniques are proposed to replace the absolute-intensity-based routes for better reliability. [30][31][32][33][34][35] Meanwhile, the ratiometric detection schemes usually result in color change of emissions, which is favorable for visualized sensing. Following the realization of multicolor ML emission via incorporation of multiple activators into same hosts simultaneously, recently, it is further discovered that the stress-sensitive ML color variation can be achieved in some specific dual-activator ML systems, [16,36] which paves the way for stress-sensing based on ratiometric ML.…”

“…In contrast, the 4f orbitals of Ln 3+ ions are shielded from the surroundings by the filled 5s 2 and 5p 6 ones, which determines that f→f transitions of Ln ions are less sensitive to the change in local crystal field compared with d→d transitions of TM ions. [25,[30][31][32][33][34] Accordingly, we propose a strategy to realize ratiometric dual-emitting ML by means of codoping lanthanide and transition-metal into CaZnOS host, where the ML intensity ratio of TM to Ln 3+ (I TM /I Ln ) is stress dependent, leading to stress-sensitive ML color change. This strategy establishes a new path for the design of novel ratiometric ML materials that can find applications in stress sensing and anticounterfeiting fields.…”

A review on the structural dependent optical properties and energy transfer of Mn4+ and multiple ion-codoped complex oxide phosphors

“…The red emission of Mn 4+ can be obtained when it is excited by 980 nm due to the energy transfer from Nd 3+ /Er 3+ /Yb 3+ to Mn 4+ ions. 13 The NIR photoluminescence maxima at 1064, 1537, and 980 nm originating from Nd 3+ /Er 3+ /Yb 3+ ions can be sensitized by Mn 4+ with excitation in the UV-vis region (200-500 nm). [13][14][15][16] The conversion of UV-vis light into NIR light at about 1064 nm through energy transfer from Mn 4+ to multiple ions is desirable to improve the conversion efficiency of solar cells by coating the phosphor layer on the surface of a crystalline Si layer.…”