Abstract
Power-based upconversion luminescence color regulation (PUCR) is especially suitable for developing luminescence-based dynamic anti-counterfeiting owing to its straightforward usage. However, it maintains a challenge for the visually remarkable Ho3+-based PUCR. Herein, favorable PUCR behavior is achieved by codoping Yb3+ and Ho3+ into the Lu2Mo4O15 lattice. It has been demonstrated that the ultrashort lifetime of the Ho3+: 5I6 level and the anomalous three-photon nature of green emission are essential. The former causes high-pure red emission at low power, while the latter enables the power-responsive tuning from reddish-orange to yellow. Compared with Er2Mo4O15:4%Tm3+ we recently reported, Lu2Mo4O15:90%Yb3+/1%Ho3+, thanks to the high solubility of Yb3+ ions, showed a ~25-fold enhancement in emission intensity. This new material is potentially applicable in dynamic luminescence anti-counterfeiting.