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Perovskite Nanocrystals Protected by Hermetically Sealing for Highly Bright and Stable Deep-Blue Light-Emitting Diodes
Advanced Science ( IF 14.3 ) Pub Date : 2023-06-04 , DOI: 10.1002/advs.202302906 Yongju Hong 1 , Chungman Yu 1 , Hyeondoo Je 1 , Jin Young Park 1 , Taekyung Kim 2 , Hionsuck Baik 2 , Gracita M Tomboc 1 , Youngseo Kim 1 , Jung Min Ha 1 , Jinwhan Joo 1 , Chai Won Kim 1 , Han Young Woo 1 , Sungnam Park 1 , Dong Hoon Choi 1 , Kwangyeol Lee 1
Advanced Science ( IF 14.3 ) Pub Date : 2023-06-04 , DOI: 10.1002/advs.202302906 Yongju Hong 1 , Chungman Yu 1 , Hyeondoo Je 1 , Jin Young Park 1 , Taekyung Kim 2 , Hionsuck Baik 2 , Gracita M Tomboc 1 , Youngseo Kim 1 , Jung Min Ha 1 , Jinwhan Joo 1 , Chai Won Kim 1 , Han Young Woo 1 , Sungnam Park 1 , Dong Hoon Choi 1 , Kwangyeol Lee 1
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Metal–halide perovskite nanocrystals (NCs) have emerged as suitable light-emitting materials for light-emitting diodes (LEDs) and other practical applications. However, LEDs with perovskite NCs undergo environment-induced and ion-migration-induced structural degradation during operation; therefore, novel NC design concepts, such as hermetic sealing of the perovskite NCs, are required. Thus far, viable synthetic conditions to form a robust and hermetic semiconducting shell on perovskite NCs have been rarely reported for LED applications because of the difficulties in the delicate engineering of encapsulation techniques. Herein, a highly bright and durable deep-blue perovskite LED (PeLED) formed by hermetically sealing perovskite NCs with epitaxial ZnS shells is reported. This shell protects the perovskite NCs from the environment, facilitates charge injection/transport, and effectively suppresses interparticle ion migration during the LED operation, resulting in exceptional brightness (2916 cd m−2) at 451 nm and a high external quantum efficiency of 1.32%. Furthermore, even in the unencapsulated state, the LED shows a long operational lifetime (T50) of 1192 s (≈20 min) in the air. These results demonstrate that the epitaxial and hermetic encapsulation of perovskite NCs is a powerful strategy for fabricating high-performance deep-blue-emitting PeLEDs.
中文翻译：
通过气密密封保护的钙钛矿纳米晶体可用于高亮度和稳定的深蓝色发光二极管
金属卤化物钙钛矿纳米晶体（NC）已成为适合发光二极管（LED）和其他实际应用的发光材料。然而，具有钙钛矿NC的LED在工作过程中会经历环境引起的和离子迁移引起的结构退化；因此，需要新颖的数控设计概念，例如钙钛矿数控的气密密封。迄今为止，由于封装技术的精细工程存在困难，在钙钛矿纳米颗粒上形成坚固且气密的半导体壳的可行合成条件很少被报道用于 LED 应用。在此，报道了一种通过用外延 ZnS 壳密封钙钛矿 NC 形成的高亮度和耐用的深蓝色钙钛矿 LED (PeLED)。该外壳保护钙钛矿NC免受环境影响，促进电荷注入/传输，并有效抑制LED运行期间的颗粒间离子迁移，从而在451 nm处产生出色的亮度（2916 cd m -2 ）和1.32%的高外量子效率。此外，即使在未封装状态下，LED在空气中也表现出 1192 秒（约 20 分钟）的长工作寿命 (T 50 )。这些结果表明，钙钛矿 NC 的外延和气密封装是制造高性能深蓝光 PeLED 的有力策略。
更新日期：2023-06-04
中文翻译：
通过气密密封保护的钙钛矿纳米晶体可用于高亮度和稳定的深蓝色发光二极管
金属卤化物钙钛矿纳米晶体（NC）已成为适合发光二极管（LED）和其他实际应用的发光材料。然而，具有钙钛矿NC的LED在工作过程中会经历环境引起的和离子迁移引起的结构退化；因此，需要新颖的数控设计概念，例如钙钛矿数控的气密密封。迄今为止，由于封装技术的精细工程存在困难，在钙钛矿纳米颗粒上形成坚固且气密的半导体壳的可行合成条件很少被报道用于 LED 应用。在此，报道了一种通过用外延 ZnS 壳密封钙钛矿 NC 形成的高亮度和耐用的深蓝色钙钛矿 LED (PeLED)。该外壳保护钙钛矿NC免受环境影响，促进电荷注入/传输，并有效抑制LED运行期间的颗粒间离子迁移，从而在451 nm处产生出色的亮度（2916 cd m -2 ）和1.32%的高外量子效率。此外，即使在未封装状态下，LED在空气中也表现出 1192 秒（约 20 分钟）的长工作寿命 (T 50 )。这些结果表明，钙钛矿 NC 的外延和气密封装是制造高性能深蓝光 PeLED 的有力策略。
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