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白光LED用Li+/La3+共掺杂BaSi2O5:Eu2+绿光发射荧光粉的制备及其发光性能和热稳定性
Preparation, Luminescence and Thermal Stability of Li+/La3+ Co-doped Single-phased BaSi2O5: Eu2+ Green Emitting Phosphors for White LEDs
- 发光学报 2020年41卷第3期 页码：271-280
- 作者机构：
东北师范大学 物理学院,吉林 长春,130024
- 作者简介：
- 基金信息：国家自然科学基金（11674050，11874103）资助项目()
DOI：10.3788/fgxb20204103.0271
中图分类号： O482.31纸质出版日期：2020-3-5，
网络出版日期：2019-12-31，
收稿日期：2019-11-24，
修回日期：2019-12-30，
扫 描 看 全 文
黄晓松, 姜荣云, 杨健等. 白光LED用Li<sup>+</sup>/La<sup>3+</sup>共掺杂BaSi<sub>2</sub>O<sub>5</sub>:Eu<sup>2+</sup>绿光发射荧光粉的制备及其发光性能和热稳定性[J]. 发光学报, 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
黄晓松, 姜荣云, 杨健等. 白光LED用Li<sup>+</sup>/La<sup>3+</sup>共掺杂BaSi<sub>2</sub>O<sub>5</sub>:Eu<sup>2+</sup>绿光发射荧光粉的制备及其发光性能和热稳定性[J]. 发光学报, 2020,41(3): 271-280 DOI： 10.3788/fgxb20204103.0271.
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.
摘要
通过Li
+
/La
3+
同比例共掺杂策略，在氢气气氛下烧结制备了Li
0.06
La
0.06
Ba
0.84
Si
2
O
5
:4% Eu
2+
（LLBSO:Eu
2+
）高效绿色发光荧光粉。相比于未掺杂样品Ba
0.96
Si
2
O
5
:4% Eu
2+
（BSO:Eu
2+
），Li
+
/La
3+
共掺有助于单一相LLBSO:Eu
2+
荧光粉的合成，能有效降低烧结的温度和缩短合成时间。我们发现该策略节约荧光粉合成成本的同时，也可以显著提高其光学性能。相关测试表明，Li
+
/La
3+
共掺杂样品平均颗粒尺寸主要分布在1.1~2.7 m，颗粒团聚现象不明显，符合涂覆LED芯片要求。该样品可以有效地被365 nm近紫外LED芯片激发，产生位于502 nm的强的宽带绿光发射，其归属于Eu
2+
的5d-4f跃迁，发光强度是未掺杂样品的168%。此外，LLBSO:Eu
2+
荧光粉在150℃时发光强度仍保持在室温时的98%左右，具有良好的热稳定性。该样品CIE坐标位于绿光区（0.217，0.410）。通过绿粉/红粉和绿粉/红粉/蓝粉混粉策略，制得了色温为2 918~4 037 K的白色发光LED，其显色指数（
Ra
）均大于85，具有良好的热稳定性。实验结果表明，Li
+
/La
3+
共掺单一相的BSO:Eu
2+
绿色发光荧光粉是制备近紫外激发白光发射LED的优良候选荧光粉材料。
Abstract
Li
+
/La
3+
co-doped Li
0.06
La
0.06
Ba
0.84
Si
2
O
5
:4% Eu
2+
(LLBSO:Eu
2+
) 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
稀土离子荧光粉光致发光白光LED
Keywords
rare earthphosphorphotoluminescencewhite LED
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