Study Of Deep-red Luminescence And Near Infrared Luminescence Of Mn⁴⁺/Cr⁴⁺?Ho³⁺/Yb³⁺ Doped Oxide

Near infrared and red light source has been widespread application in heating,physical therapy,night vision,communication,navigation,plant cultivation and livestock breeding,and other fields.Photoluminescence is one of the main methods to obtain near infrared light source.In this paper is prepared?Li1-xAx?2MgTiO4:Mn⁴⁺/Cr³⁺?A = Na and K?phosphor through a conventional solid-state reaction method in air atmosphere,and prepared Ba Zr0.8Y0.2O3-?: Yb³⁺/Ho³⁺ emitting phosphor by co-precipitation method.We also tested their luminous properties and discussed their luminous mechanisms.We research?Li1-x Ax?2MgTiO4: Mn⁴⁺/Cr³⁺?A = Na and K?deep red phosphor through a conventional solid-state reaction method in air atmosphere.When part of Li+ions is substituted by other alkaline metal?Na+or K+?in the host,the luminescence intensity of?Li0.97Na0.03?2MgTi0.999O4: 0.001Mn⁴⁺ and?Li0.95K0.05?2MgTi0.999O4: 0.001Mn⁴⁺ was 1.7 and 2.5 times higher than that of Li2MgTi0.999O4: 0.001Mn⁴⁺,respectively.In the Mn⁴⁺/Cr³⁺co-doped?Li0.95K0.05?2MgTi0.999O4,both 726 nm of Cr³⁺ ions and 678 nm of Mn⁴⁺ ions can be observed.It is interesting to find that the intensity ratio 726 nm to 678 nm emissions in the Mn⁴⁺/Cr³⁺ions phosphor continually increases with excitation wavelength increasing from 290 nm to 455 nm.This characteristic refers a possible approach to design novel compact light-wavelength detector or spectrometer based on the phosphor.We research Ba Zr0.8Y0.2O3-?: Yb³⁺/Ho³⁺ near-infrared emitting phosphor by co-precipitation method.In the Ho³⁺/Yb³⁺ co-doped Ba Zr0.8Y0.2O3-?,observer the Ho³⁺-Yb³⁺ions between in the near-infrared quantum cutting luminescence.At the same time,all the samples present very weak Yb³⁺ emission due to the efficient Yb³⁺? Ho³⁺ back energy transfer.Therefore,it is possible to obtain pure near-infrared emission of Ho³⁺ions and helpful for the enhancement of Ho³⁺ions emission efficiency in near-infrared region.And developed based on the luminous intensity ratio method to estimate the energy transfer efficiency.The optimum sample for near infrared emission is BaZr0.7Y0.08O3-?: 0.12Yb³⁺,0.1Ho³⁺,in which the energy transfer form Ho³⁺ to Yb³⁺ ions is 52.8% and 90% of near infrared emission is performed by the energy transfer.This research may provide meaningful reference for designing efficient new photonic devices.