当前位置：
X-MOL 学术
›
J. Mater. Chem. C
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Site occupation and energy transfer of Ce3+-activated lithium nitridosilicate Li2SrSi2N4 with broad-yellow-light-emitting property and excellent thermal stability
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1039/c7tc04397j Jianyan Ding 1, 2, 3, 4, 5 , Hongpeng You 6, 7, 8, 9, 10 , Yichao Wang 1, 2, 3, 4, 5 , Bo Ma 1, 2, 3, 4, 5 , Xufeng Zhou 1, 2, 3, 4, 5 , Xin Ding 1, 2, 3, 4, 5 , Yaxin Cao 1, 2, 3, 4, 5 , Hang Chen 1, 2, 3, 4, 5 , Wanying Geng 6, 7, 8, 9, 10 , Yuhua Wang 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-03-05 00:00:00 , DOI: 10.1039/c7tc04397j Jianyan Ding 1, 2, 3, 4, 5 , Hongpeng You 6, 7, 8, 9, 10 , Yichao Wang 1, 2, 3, 4, 5 , Bo Ma 1, 2, 3, 4, 5 , Xufeng Zhou 1, 2, 3, 4, 5 , Xin Ding 1, 2, 3, 4, 5 , Yaxin Cao 1, 2, 3, 4, 5 , Hang Chen 1, 2, 3, 4, 5 , Wanying Geng 6, 7, 8, 9, 10 , Yuhua Wang 1, 2, 3, 4, 5
Affiliation
|
The abundant nitridosilicate-based phosphors have been found due to the various connection types of [SiN4] tetrahedron such as corner-, edge- and even face-shared structures. The stable and tight frameworks formed by the [SiN4] tetrahedron lead to excellent luminescence properties. In this study, the lithium nitridosilicate Li2SrSi2N4 with a special crystal structure has been successfully synthesized by gas pressure sintering. The Rietveld refinement indicates that Li2SrSi2N4 is made up of two kinds of [SiN4] tetrahedron rings called dreier and siebener rings, and it is more stable than the structure formed by chains. Moreover, the channel built by the ring provides a suitable location for the cations to occupy. With the introduction of Ce3+ ions, the yellow light centering at 553 nm has been observed, and the broad excitation band ranging from 250 to 450 nm matches well with that of blue LED chips. Additionally, two Sr2+ sites occupied by Ce3+ ions broaden the emission band including the red region, and the energy transfer happens between the two sites, which has been proved by the time-resolved photoluminescence (TRPL) spectra. When compared with commercial YAG:Ce3+, Li2SrSi2N4:Ce3+ not only has a broad emission band leading to the decrease in CCT, but also presents excellent thermal stability; at 150 °C the emission intensity still remains beyond 90% of the initial intensity at room temperature. The results indicate that this special crystal structure is worthy of further investigation for practical applications.
中文翻译：
Ce 3+活化的亚硝基硅酸锂Li 2 SrSi 2 N 4的现场占据和能量转移，具有宽泛的黄色发光性能和出色的热稳定性
由于[SiN 4 ]四面体的各种连接类型，例如角，边，甚至面共享结构，已经发现了丰富的基于亚硝酸硅的磷光体。由[SiN 4 ]四面体形成的稳定且紧密的骨架导致优异的发光性能。本研究通过气压烧结成功地合成了具有特殊晶体结构的氮化硅氮化锂Li 2 SrSi 2 N 4。Rietveld精炼表明，Li 2 SrSi 2 N 4由两种[SiN 4]四面体环称为dreier和siebener环，它比链形成的结构更稳定。而且，由环建立的通道为阳离子占据提供了合适的位置。通过引入Ce 3+离子，可以观察到以553 nm为中心的黄光，并且250至450 nm的宽激发带与蓝色LED芯片的激发带非常匹配。此外，Ce 3+离子占据的两个Sr 2+位点加宽了包括红色区域在内的发射带，并且在这两个位点之间发生了能量转移，这已通过时间分辨光致发光（TRPL）光谱进行了证明。与市售YAG：Ce 3+相比，Li 2 SrSi 2 N4：Ce 3+不仅具有较宽的发射带，导致CCT降低，而且具有出色的热稳定性。在150°C下，发射强度仍保持在室温下初始强度的90％以上。结果表明，这种特殊的晶体结构值得在实际应用中进一步研究。
更新日期：2018-03-05
中文翻译：
Ce 3+活化的亚硝基硅酸锂Li 2 SrSi 2 N 4的现场占据和能量转移，具有宽泛的黄色发光性能和出色的热稳定性
由于[SiN 4 ]四面体的各种连接类型，例如角，边，甚至面共享结构，已经发现了丰富的基于亚硝酸硅的磷光体。由[SiN 4 ]四面体形成的稳定且紧密的骨架导致优异的发光性能。本研究通过气压烧结成功地合成了具有特殊晶体结构的氮化硅氮化锂Li 2 SrSi 2 N 4。Rietveld精炼表明，Li 2 SrSi 2 N 4由两种[SiN 4]四面体环称为dreier和siebener环，它比链形成的结构更稳定。而且，由环建立的通道为阳离子占据提供了合适的位置。通过引入Ce 3+离子，可以观察到以553 nm为中心的黄光，并且250至450 nm的宽激发带与蓝色LED芯片的激发带非常匹配。此外，Ce 3+离子占据的两个Sr 2+位点加宽了包括红色区域在内的发射带，并且在这两个位点之间发生了能量转移，这已通过时间分辨光致发光（TRPL）光谱进行了证明。与市售YAG：Ce 3+相比，Li 2 SrSi 2 N4：Ce 3+不仅具有较宽的发射带，导致CCT降低，而且具有出色的热稳定性。在150°C下，发射强度仍保持在室温下初始强度的90％以上。结果表明，这种特殊的晶体结构值得在实际应用中进一步研究。
京公网安备 11010802027423号