OPTICS EXPRESS
·
2025
·Vol. 33
·期 3
·4940-4956
·
IF 3.3
Changran Zheng,Baotong Guo,Tianhe Lu,Xi Zhu,Xi Zhu,Bingxuan Xia,Bobo Yang,Zhoudong Yang,Sergey Lishik,Anton Chernyakov,Jingkang Xiong,Jiajie Fan
(Sr, Ca)AlSiN3:Eu2+ (SCASN) phosphors are widely applied in white LEDs to enhance the red spectral component, thereby improving spectral coverage and potentially contributing to a higher color rendering index. However, the rapid degradation of SCASN phosphors under highly thermal and thermal-humidity conditions restricts broader application. In this study, silica-coated SCASN phosphors were prepared via rapid plasma-assisted film deposition. The 54 nm silica coating significantly altered the wettability, optical properties, and stability of the phosphors. After the silica surface coating, the water contact angle increased from 20° to 125.5°, indicating enhanced hydrophobicity. Further photoluminescence (PL) test results demonstrated an improvement in intensity for the coated phosphor compared to the uncoated phosphor. Moreover, after aging at 100°C and 100% relative humidity for 336 hours, the PL intensity of the uncoated phosphor decreased to 65% of its original value, while the coated phosphor maintained 88.5%. This excellent stability is attributed to the protective silica coating, which acts as a barrier against moisture penetration and prevents the hydrolysis of the phosphor surface. First-principles density functional theory calculations further demonstrated that unsaturated O-Si groups formed during HDMSO decomposition create a silica coating, reducing the surface H2O adsorption energy from -2.544 eV to -0.062 eV. The plasma-assisted deposition method effectively enhances phosphor stability, promoting the development of durable and high-performance LED phosphors.
研究领域:
材料科学
·
光学工程
·
表面化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2017
·
IF 2.238
Chaoyang Ma,Yongge Cao,Xiaofei Shen,Zicheng Wen,Ran Ma,Jiaqi Long,Xuanyi Yuan
Nowadays, major commercial w-LEDs fabricated by the traditionally gold-wire-welding packaging technology have undergone considerable development as indoor/outdoor lighting sources due to its high-energy utilization efficiency, long service life, environmental friendliness, and excellent chromatic stability. While, new generation applications in projections, automotive lighting, street lighting, plaza lighting, and high-end general lighting need further improvements in power handling and light extraction. Herein, transparent Ce:YAG glass-ceramics (GCs) phosphor was prepared by low-temperature co-sintering polycrystalline Ce:YAG phosphor powder and home-made PbO-B 2 O 3 -ZnO-SiO 2 glass powder. Thereafter, the flip-chip (FC) w-LEDs were fabricated with the GCs phosphor plates and FC blue chips. The GCs-based FC w-LEDs show not only excellent heat- and humidity-resistance characteristics, but also superior optical performances with an LE of 112.8 lm/W, a CRI of 71.2, a CCT of 6103 K as well as a chromaticity coordinate of (0.3202, 0.3298), under a high operation current of 400 mA. The technology route will open a practically commercial feasible approach to achieve excellent performances for advanced high-power FC w-LEDs.
研究领域:
材料科学
·
光学工程
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-10
·
IF 11.878
Yang Weifeng,Gong Wei,Hou Chengyi,Su Yun,Guo Yinben,Zhang Wei,Li Yaogang,Zhang Qinghong,Wang Hongzhi
Developing fabric-based electronics with good wearability is undoubtedly an urgent demand for wearable technologies. Although the state-of-the-art fabric-based wearable devices have shown unique advantages in the field of e-textiles, further efforts should be made before achieving “electronic clothing” due to the hard challenge of optimally unifying both promising electrical performance and comfortability in single device. Here, we report an all-fiber tribo-ferroelectric synergistic e-textile with outstanding thermal-moisture comfortability. Owing to a tribo-ferroelectric synergistic effect introduced by ferroelectric polymer nanofibers, the maximum peak power density of the e-textile reaches 5.2 W m −2 under low frequency motion, which is 7 times that of the state-of-the-art breathable triboelectric textiles. Electronic nanofiber materials form hierarchical networks in the e-textile hence lead to moisture wicking, which contributes to outstanding thermal-moisture comfortability of the e-textile. The all-fiber electronics is reliable in complicated real-life situation. Therefore, it is an idea prototypical example for electronic clothing.
研究领域:
材料科学
·
电子学
·
纺织工程
·
可穿戴技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）