Conventional and Inverted Light-Emitting Diodes with 386 nm Emission Wavelength Based on Metal-Free Carbon Dots,ACS Applied Materials & Interfaces

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Conventional and Inverted Light-Emitting Diodes with 386 nm Emission Wavelength Based on Metal-Free Carbon Dots
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-03-29 , DOI: 10.1021/acsami.3c00036
Tianyang Zhang ₁ , Xiao Wang ₁ , Hui Huang ₁ , Yang Liu ₁ , Zhenhui Kang _{1,

2}

Affiliation

Ultraviolet (UV) light-emitting diodes (LEDs) are of great concern due to wide applications in the fields of solid-state displays, photocommunication, and scientific and medical instruments. During the past 10 years, organic and inorganic semiconductors have made great breakthroughs in short-wavelength emission. Nowadays, carbon dots (CDs), which possess distinctive superiorities of high stability, nontoxicity, and low cost, are promising all-band emission materials for the next generation of LEDs. However, the fabrication of CD-based LEDs (CD-LEDs) with emission wavelengths below 400 nm is still a huge limitation in this field. Herein, we prepared UV emission CDs with the photoluminescence emission wavelength of 371 nm. The UV-CDs are perfectly compatible with both conventional and inverted device structures so as to realize the currently shortest electroluminescent emission wavelength of 386 nm for CD-LEDs. The conventional UV-CD-LEDs possess the optimum luminance of 268 cd m^–2 (5427 W sr^–1 m^–2) with an external quantum efficiency (EQE) of 1.115%. Meanwhile, the inverted UV-CD-LEDs possess the optimum luminance of 132 cd m^–2 (2673 W sr^–1 m^–2) with an EQE of 0.869%. This work paves a new road to manufacture carbon nanomaterial-based UV emission devices with high luminance, EQE, and stability.

中文翻译：

基于无金属碳点的发射波长为 386 nm 的常规和倒置发光二极管

紫外 (UV) 发光二极管 (LED) 因其在固态显示、光通信以及科学和医疗仪器领域的广泛应用而备受关注。近10年来，有机和无机半导体在短波发射方面取得了重大突破。如今，碳点（CDs）具有稳定性高、无毒、成本低等显着优势，有望成为下一代LED的全波段发光材料。然而，发射波长低于 400 nm 的基于 CD 的 LED (CD-LED) 的制造仍然是该领域的一个巨大限制。在此，我们制备了光致发光发射波长为 371 nm 的紫外发射 CD。UV-CD与常规和倒置器件结构完美兼容，实现CD-LED目前最短的386nm电致发光发射波长。传统的 UV-CD-LED 拥有 268 cd m 的最佳亮度^–2 (5427 W sr ^–1 m ^–2 )，外量子效率 (EQE) 为 1.115%。^{同时，反向 UV-CD-LED 拥有 132 cd m –2} (2673 W sr ^–1 m ^–2 )的最佳亮度和 0.869% 的 EQE。这项工作为制造具有高亮度、EQE 和稳定性的基于碳纳米材料的紫外线发射装置铺平了道路。

更新日期：2023-03-29

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