Microscale Perovskite Quantum Dot Light‐Emitting Diodes (Micro‐PeLEDs) for Full‐Color Displays. Issue 12 (15th April 2022)

• Record Type: Journal Article
• Authors: Bai, Wenhao; Xuan, Tongtong; Zhao, Haiyan; Shi, Shuchen; Zhang, Xiaoyu; Zhou, Tianliang; Wang, Le; Xie, Rong‐Jun
• Is Part Of: Advanced optical materials. Volume 10:Issue 12(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-04-15
• Subjects: displays -- electroluminescence -- inkjet printing -- light‐emitting diodes -- perovskites; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202200087
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Group III–V semiconductor‐based microscale light‐emitting diode (micro‐LED) displays are recognized as one of the most promising display technologies with superhigh brightness and resolution, strong contrast, and superlarge color gamut but currently suffer from low efficiency, low production yield, and high cost. Here, it is proposed to realize cost‐effective and full‐color micro‐LED displays by using microscale perovskite quantum dot LEDs (micro‐PeLEDs) as emitters. Bright and uniform red‐, green‐, and blue‐emitting (RGB) micro‐PeLED arrays with each pixel size as small as 45 µm are fabricated by in situ inkjet printing a perovskite quantum dot (PeQD) emissive layer in the structure of indium tin oxide/poly(3, 4‐ethylenedioxythiophene)‐poly(styrenesulfonate) (PEDOT:PSS)/poly(9‐vinylcarbazole) (PVK)/sodium dodecyl sulfate (SDS)/PeQD/1, 3, 5‐tris(1‐phenyl‐1 H ‐benzimidazol‐2‐yl)benzene (TPBi)/LiF/Al. These RGB micro‐PeLED arrays display an external quantum efficiency of 0.832%, 0.419%, and 0.052% for red, green, and blue colors, a resolution of 210 PPI, and a wide color gamut (135% of the National Television Standards Committee standard). The authors further demonstrate flexible and full‐color active‐matrix micro‐PeLED displays, which have potential applications in future ultrahigh‐definition displays, light communication, and artificial intelligence. Abstract : Microscale perovskite quantum dot light‐emitting diodes (micro‐PeLEDs) are fabricated through an "interface engineering‐inkjet printing‐plasma etching" strategy using perovskite quantum dot arrays as the emissive layer for full‐color displays with the advantages of low cost, free massive transfer, high resolution, and suitability for large‐area or flexible displays. This provides a new approach for the development of micro‐LEDs.