Preparation And Performance Study Of Er³⁺,Yb³⁺ Co-doped Gadolinium Yttrium Oxide Transparent Laser Ceramic

Er,Yb:?YGd?₂O₃ ceramic powder was prepared by the citric acid-gel combustion method using citric acid as the combustion agent and PEG with the molecular weight of 10000 as the dispersant.The results show that the optimum conditions for ceramic powders: the mole fraction of Gd³⁺ was 30%,the mole fraction of Er³⁺ was 4%,the mole fraction of Yb³⁺ was 5%,the pH was 8 and the calcination temperature was 1000?.The Er,Yb:?YGd?₂O₃ transparent ceramic was prepared by cold isostatic pressing and vacuum sinteringmethod.The results show that the optimum technological conditions for ceramic: sintering temperature is 1750?,holding-time is 20 h,at 1400 ?annealing treatment under air atmosphere,annealing time is 20 h.The average transmittance of the ceramic sample is about 70% in the visible range and 65% in the near infrared region.The samples were characterized by X-ray diffraction.The XRD patterns of the samples are consistent with the standard card JCPDS#?65-3178?of Y₂O₃,suggesting that the sample still remains cubic phase.Through analyzing the scanning electron microscopy,the average particle of nano-powder is about 55 nm.The up-conversion spectra of the sampleshas been tested.The results prove thatthe emergence of green light and red light are located at 562 nm and658nm,which are corresponding to ⁴S_3/2/²H_11/2?⁴I_15/2 and ⁴F_9/2?⁴I_15/2 transition of Er³⁺,respectively.Under the excitation of 980 nm pump light,the emission intensity of green light and red light depend on the lifetime of ⁴I_11/2 energy level of Er³⁺ and the aggregation of the number of particles on ⁴I_11/2,⁴I_13/2 energy level of Er³⁺.