Controllable and white upconversion luminescence in LiNbO3:Ln3+ (Ln = Ho, Yb, Tm) single crystals

- Controllable and white upconversion emissions are obtained.
- Ideal white-light emissions can be obtained with pump power from 100 mW to 900 mW.
- Energy transfer process of RE ions and pump power result in the color variation.
- Great inspirations are given in realizing the target color of interest.