Wang Li, Shang Zhaojiang, Shi Mingming, Cao Peiyuan, Yang Bobo, Zou Jun
School of Science, Shanghai Institute of Technology Shanghai 201418 PR China
Institute of New Materials & Industrial Technology, Wenzhou University Wenzhou 325024 PR China.
RSC Adv. 2020 Mar 20;10(19):11418-11425. doi: 10.1039/d0ra00628a. eCollection 2020 Mar 16.
Owing to its stability and environment-friendly properties, the SrAlO:Eu, Dy (SAOED) phosphor has attracted major scientific interest. With various applications, such as in emergency signage, luminous paints, and traffic signs, it can have a considerable impact on everyday activities. However, SrAlO easily undergoes hydrolysis in the presence of atmospheric moisture. To remedy this, we prepared a phosphor film by spin coating to improve its water resistance. The SAOED was coated with epoxy resin glue without destroying the SrAlO crystals. A series of reliability tests were conducted on the phosphor films and bare phosphors: high-temperature and high-humidity (HT) tests, thermal-cycling (TC) tests, and xenon lamp aging (XLG) tests. Then, the crystal phase, surface morphology, photoluminescence (PL), afterglow decay, and temperature-dependent PL were analyzed. The X-ray diffraction patterns show that the hydrolysis reaction of SAOED occurred easily, with the SrAlO phase becoming the SrAl (OH) phase and SrAlO(OH) generated under HT tests. The PL intensity of the thin film of SAOED decreased 57.2%, 79.3%, and 98.8% after HT tests, XLG tests for 168 h, and TC tests with 10 repetitions from 233 K to 423 K, respectively. Moreover, the afterglow decay time of the SAOED phosphor film was longer than that of bare phosphors. The developed flexible films are excellent candidates for temperature sensing because they exhibit temperature-dependent PL intensity and are highly sensitive to surrounding temperature variation 300-420 K. Thus, SAOED films with stable luminescent signals can be used in energy-efficient, long-lasting temperature-sensing devices, which, apart from being environment-friendly, play a role in improving public safety infrastructure.
由于其稳定性和环境友好特性，SrAlO:Eu, Dy（SAOED）荧光粉引起了科学界的广泛关注。它具有多种应用，如用于应急标识、发光涂料和交通标志等，对日常活动会产生相当大的影响。然而，SrAlO在大气湿度存在的情况下容易发生水解。为了解决这个问题，我们通过旋涂制备了一种荧光粉薄膜以提高其耐水性。SAOED被涂上环氧树脂胶而不破坏SrAlO晶体。对荧光粉薄膜和裸荧光粉进行了一系列可靠性测试：高温高湿（HT）测试、热循环（TC）测试和氙灯老化（XLG）测试。然后，分析了晶相、表面形貌、光致发光（PL）、余辉衰减和温度依赖PL。X射线衍射图谱表明，SAOED的水解反应很容易发生，在HT测试下，SrAlO相变为SrAl(OH)相并生成SrAlO(OH)。SAOED薄膜在HT测试、168小时的XLG测试以及从233K到423K进行10次重复的TC测试后，其PL强度分别下降了57.2%、79.3%和98.8%。此外，SAOED荧光粉薄膜的余辉衰减时间比裸荧光粉的长。所开发的柔性薄膜是温度传感的理想候选材料，因为它们表现出温度依赖的PL强度，并且对300 - 420K的周围温度变化高度敏感。因此，具有稳定发光信号的SAOED薄膜可用于节能、持久的温度传感设备，这些设备除了环境友好外，还在改善公共安全基础设施方面发挥作用。
