Silane-based wet and plasma coating on SrAl2O4:Eu2+, Dy3+ phosphor for surface modification

• Published in: Current applied physics 2022-06, Vol.38, p.99-106
• Main Authors: Yoo, Jung Hyeon, Kim, Bo Young, Jeong, Seong Guk, Kwon, Seok Bin, Yoo, Ho Chan, Choi, Seung Hee, Song, Young Hyun, Kang, Bong Kyun, Yoon, Dae Ho
• Format: Article
• Language: English
• Subjects: Organic coating; Persistent phosphor; Plasma coating process; Stability enhancement
• ISSN: 1567-1739; 1878-1675
• DOI: 10.1016/j.cap.2022.03.006

To date, organizations in many countries have tried persistent phosphors to apply in the field of safety facilities such as road striping and signs to improve visibility. However, the road facilities were usually exposed to harsh conditions such as pouring and wearing. Therefore, the surface coating and modifications of the phosphor are researched to improve the stability and adhesivity for binder material. Herein, we report the comparison of wet and plasma coating method for surface modification. Three kinds of silane functional materials for coating agent with different characteristic was chosen. From the results, we could confirm that the uniformity of the coating is better in the case of the plasma process. And the plasma-coated phosphor with the coating agent which has long carbon chain maintains the luminescence intensity over 50% after soaking in water for 48h, despite the pristine phosphor almost loses the luminescence characteristics occurring the phase transition. [Display omitted] •Silane coating material based plasma coating has performed.•Thin uniform coating formation through plasma coating has confirmed.•Coating process does not affect to luminescence performance of SrAl2O4:Eu2+,Dy3+.•After soaking, HDTMS plasma coated SAO maintained above 50% of emission intensity.