HUANG Xiao-song, JIANG Rong-yun, YANG Jian etc. Preparation, Luminescence and Thermal Stability of Li<sup>+</sup>/La<sup>3+</sup> Co-doped Single-phased BaSi<sub>2</sub>O<sub>5</sub>: Eu<sup>2+</sup> Green Emitting Phosphors for White LEDs[J]. Chinese Journal of Luminescence, 2020,41(3): 271-280
HUANG Xiao-song, JIANG Rong-yun, YANG Jian etc. Preparation, Luminescence and Thermal Stability of Li<sup>+</sup>/La<sup>3+</sup> Co-doped Single-phased BaSi<sub>2</sub>O<sub>5</sub>: Eu<sup>2+</sup> Green Emitting Phosphors for White LEDs[J]. Chinese Journal of Luminescence, 2020,41(3): 271-280 DOI: 10.3788/fgxb20204103.0271.
Preparation, Luminescence and Thermal Stability of Li+/La3+ Co-doped Single-phased BaSi2O5: Eu2+ Green Emitting Phosphors for White LEDs
) green-emitting phosphors were prepared through a high-temperature solid state reaction. Compared with undoped Ba
0.96
Si
2
O
5
:4% Eu
2+
(BSO:Eu
2+
) sample
it can be found that Li
+
/La
3+
co-doping is an efficient strategy for synthesizing single-phased LLBSO:Eu
2+
at lower temperature in less synthesis time. Our results indicate that this strategy can lead to not only the reduced cost but also the improved optical performances. The related tests suggest that
for Li
+
/La
3+
co-doped BSO:Eu
2+
phosphors
the particle size is in the range of 1.1-2.7 m and no obvious aggregation can be found
suggesting that it meets the requirements for coating LED chips. Upon near-ultraviolet LED chip (365 nm) excitation
LLBSO:Eu
2+
exhibits a strong broadband emission around 502 nm
which is attributed to the 5d-4f transition of Eu
2+
. Its luminescent intensity reaches 168% as strong as that of the undoped sample. Furthermore
for LLBSO:Eu
2+
phosphor
the luminescent intensity measured at 150℃ is~98% as strong as that measured at room temperature
suggesting it has good thermal stability. The CIE coordinate of LLBSO:Eu
2+
phosphors is (0.217
0.410)
which locates in the green light region. White LEDs with different color temperatures ranging from 2 918 K to 4 037 K
were fabricated using blend strategies. These LEDs exhibit high color rendering index (
Ra
>
85) and good thermal stability. Our studies suggest that LLBSO:Eu
2+
green-emitting phosphor is one kind of candidates for fabricating near-ultraviolet excited white LEDs.
关键词
Keywords
references
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Related Institution
School of Physics, Northeast Normal University
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