%0 Journal Article
%A Zhou, Weijie
%A Gu, Meng
%A Ou, Yiyi
%A Zhang, Caihua
%A Zhang, Xuejie
%A Zhou, Lei
%A Liang, Hongbin
%D 2017
%T Concentration-Driven Selectivity of Energy Transfer
Channels and Color Tunability in Ba3La(PO4)3:Tb3+, Sm3+ for Warm White LEDs
%U 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
%R 10.1021/acs.inorgchem.7b00737.s001
%2 https://ndownloader.figshare.com/files/8687524
%K CCT
%K emission color
%K chromaticity stability
%K interaction mechanisms
%K near-UV WLED
%K concentration-dependent 5 D 3
%K ET processes
%K 5 D 3
%K 5 D 4 channel
%K 5 D 4 emissions
%K concentration-driven selectivity
%K 5 D 3 channel
%K 5 D 4 channels
%K light-emitting diodes
%K PO 4
%K Warm White LEDs
%K Energy Transfer Channels
%K Concentration-Driven Selectivity
%K emission color tunability
%K Sm
%K phosphor
%K Tb
%K BLPO
%K Color Tunability
%K doping concentrations
%K energy transfer
%X Here, we report the large-scale emission
color tunability in Ba3La(PO4)3:Tb3+, Sm3+ (BLPO:TS) system based on the detailed
discussion on the concentration-driven
selectivity of energy transfer (ET) channels from Tb3+ to
Sm3+. It is induced by the concentration-dependent 5D3 and 5D4 emissions of Tb3+ and the different interaction mechanisms of ET from Tb3+ to Sm3+ via 5D3 and 5D4 channels. In the diluted Tb3+ scenario,
the red emission of Sm3+ is efficiently sensitized via
the 5D3 channel, while in the concentrated Tb3+ case, the contribution of 5D4 channel
is dominant. Therefore, by simply adjusting the doping concentrations
of Tb3+ and Sm3+, 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 Tb3+, Sm3+ coactivated
phosphor Ba3La0.90Tb0.05Sm0.05(PO4)3 (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, Ra ≈ 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 Tb3+ and Sm3+ activated
phosphors.
%I ACS Publications