posted on 2024-03-11, 15:04authored byHang Liu, Jian Liu, Bo Sun, Ziyi Zhang, Chongshan Jiao, Ding Sun, LiXin Zhang, Yuhong Zhang
Herein, Bi3+/Mn4+ doped Ca2LaTaO6 phosphors with a double-perovskite structure
were successfully
synthesized with solid-state reaction at high temperature. The photoluminescence
(PL) performances were investigated in detail. The blue radiation
(∼465 nm) from the Bi3+ ion and the red radiation
(∼686 nm) originating from the Mn4+ ion were obtained
under 313 nm excitation. Especially, the pathway of energy transfer
(Bi3+ → Mn4+) contributes to enhance
the red emission intensity (Mn4+: ∼686 nm) in Ca2LaTaO6:Bi3+/Mn4+ system.
The PL mechanism of Ca2LaTaO6:Bi3+/Mn4+ was analyzed through luminescence lifetimes and
PL spectra. Moreover, the emitting bands of Ca2LaTaO6:Bi3+/Mn4+ were primarily matched with
the absorbing bands of carotenoids and phytochrome PFR on
behalf of plant growth, so the phosphors were suitable for the design
of a plant growth light under near-ultraviolet to blue excitation.
At last, the optical temperature dependent performances of the Ca2LaTaO6:Bi3+/Mn4+ were analyzed
with luminescence intensity ratio technology. The sample has presented
excellent temperature measuring relative sensitivity (SR = 2.106% K–1). The results illustrated
that the Ca2LaTaO6:Bi3+/Mn4+ phosphor also can be used to develop an optical temperature sensor.