Efficient Color Tuning of Upconversion Luminescence from Core-Shell Oxysulfide Nanoparticles

Table 1

Calculated luminescence lifetimes of Y₂O₂S: Er³⁺ @ Y₂O₂S: Yb³⁺, Ho³⁺ and Y₂O₂S: Yb³⁺, Er³⁺ samples.

Transition	Lifetime (μs)
	Y2O2S: Er^3+ @ Y2O2S: Yb^3+, Ho^3+	Y2O2S: Yb^3+, Er^3+
^4S3/2 → ^4I15/2 (548 nm)	37.8	21.8
^4F9/2 → ^4I15/2 (670 nm)	139.1	46.1