Effect of Ce dopant on upconversion and temperature sensing performances in homogeneous ultrasmall Y2O3:Yb3+/Ho3+ nanoparticles through flame aerosol synthesis

Identification of Phase Evolution through Upconversion Emission in Flame-Made YAG:Yb3+/Er3+ Nanoparticles: Implications for the Optical Crystal-Phase Probe

“…None of the chemicals were purified further. The YAG:Yb 3+ /Er 3+ NPs were synthesized by FSP with some modifications. − The above nitrates are mixed and dissolved in n -butanol for preparation of the FSP precursor. For the mixture n -butanol solution, the molar ratio of rare earth ions (Y 3+ , Yb 3+ , Er 3+ ) and Al 3+ ions was fixed to 3:5; the Yb 3+ and Er 3+ ions account for 8 and 1 mol % of the total rare earth elements, respectively.…”

“…Then, the precursor was fed into a self-built swirl-stabilized spray flame reactor for FSP synthesis (Figure S1). − The mixed methane (3 L min – 1 ) and air (30 L min – 1 ) were ignited to develop a tubular premixed swirl flame. The precursor and air for spraying were injected through the tubular swirl flame with rates of 1.2 L h – 1 and 15 L min – 1 , respectively, to establish the spray flame for NP synthesis.…”

Up-Conversion Luminescence and Optical Temperature Sensing Behaviour of Y2O3:Ho3+, Yb3+ Phosphors

“…Moreover, some studies report on temperature sensors that are based on ratiometric measurements of the sensing of the 3 K 8 → 5 I 8 and 5 F 3 → 5 I 8 transitions (blue band emissions), which are due to three photon UC processes, and they typically need much higher power of excitation [46,47]. Additionally, other studies focus on TCLs that use the 5 F 4 → 5 I 8 and 5 S 2 → 5 I 8 transitions in the two green bands, which may not be the best method for temperature monitoring since the bands are spectrally overlapped [48][49][50]. The difference in sensitivity results could also result due to the different experimental conditions of the Ho 3+ , Yb 3+ co-doped UC host materials.…”