10.1021/acs.inorgchem.7b00737.s001
Weijie Zhou
Weijie
Zhou
Meng Gu
Meng
Gu
Yiyi Ou
Yiyi
Ou
Caihua Zhang
Caihua
Zhang
Xuejie Zhang
Xuejie
Zhang
Lei Zhou
Lei
Zhou
Hongbin Liang
Hongbin
Liang
Concentration-Driven Selectivity of Energy Transfer
Channels and Color Tunability in Ba<sub>3</sub>La(PO<sub>4</sub>)<sub>3</sub>:Tb<sup>3+</sup>, Sm<sup>3+</sup> for Warm White LEDs
American Chemical Society
2017
CCT
emission color
chromaticity stability
interaction mechanisms
near-UV WLED
concentration-dependent 5 D 3
ET processes
5 D 3
5 D 4 channel
5 D 4 emissions
concentration-driven selectivity
5 D 3 channel
5 D 4 channels
light-emitting diodes
PO 4
Warm White LEDs
Energy Transfer Channels
Concentration-Driven Selectivity
emission color tunability
Sm
phosphor
Tb
BLPO
Color Tunability
doping concentrations
energy transfer
2017-06-16 18:22:14
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Concentration-Driven_Selectivity_of_Energy_Transfer_Channels_and_Color_Tunability_in_Ba_sub_3_sub_La_PO_sub_4_sub_sub_3_sub_Tb_sup_3_sup_Sm_sup_3_sup_for_Warm_White_LEDs/5116210
Here, we report the large-scale emission
color tunability in Ba<sub>3</sub>La(PO<sub>4</sub>)<sub>3</sub>:Tb<sup>3+</sup>, Sm<sup>3+</sup> (BLPO:TS) system based on the detailed
discussion on the concentration-driven
selectivity of energy transfer (ET) channels from Tb<sup>3+</sup> to
Sm<sup>3+</sup>. It is induced by the concentration-dependent <sup>5</sup>D<sub>3</sub> and <sup>5</sup>D<sub>4</sub> emissions of Tb<sup>3+</sup> and the different interaction mechanisms of ET from Tb<sup>3+</sup> to Sm<sup>3+</sup> via <sup>5</sup>D<sub>3</sub> and <sup>5</sup>D<sub>4</sub> channels. In the diluted Tb<sup>3+</sup> scenario,
the red emission of Sm<sup>3+</sup> is efficiently sensitized via
the <sup>5</sup>D<sub>3</sub> channel, while in the concentrated Tb<sup>3+</sup> case, the contribution of <sup>5</sup>D<sub>4</sub> channel
is dominant. Therefore, by simply adjusting the doping concentrations
of Tb<sup>3+</sup> and Sm<sup>3+</sup>, the emission color of the
phosphors can be tuned from green to red. In view of the phosphors
with red emissions are critical to the warm white light-emitting diodes
(WLEDs), an orange-red Tb<sup>3+</sup>, Sm<sup>3+</sup> coactivated
phosphor Ba<sub>3</sub>La<sub>0.90</sub>Tb<sub>0.05</sub>Sm<sub>0.05</sub>(PO<sub>4</sub>)<sub>3</sub> (BLPO:5T5S) with good thermal and chromaticity
stability and internal quantum efficiency ∼67% is developed
in the system. Then, a near-UV WLED (CCT ≈ 4500 K, <i>R</i><sub>a</sub> ≈ 81) is fabricated using this phosphor.
These findings not only indicate that the orange-red phosphor BLPO:5T5S
is available for near-UV warm white LEDs but also deliver new insights
into the ET processes in Tb<sup>3+</sup> and Sm<sup>3+</sup> activated
phosphors.