[논문]Recent Progress in High-Luminance Quantum Dot Light-Emitting Diodes

Rhee, Seunghyun; Kim, Kyunghwan; Roh, Jeongkyun; Kwak, Jeonghun

doi:10.3807/copp.2020.4.3.161

Recent Progress in High-Luminance Quantum Dot Light-Emitting Diodes 원문보기

Current optics and photonics, v.4 no.3, 2020년, pp.161 - 173

Rhee, Seunghyun (Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center (ISRC), Seoul National University) , Kim, Kyunghwan (Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center (ISRC), Seoul National University) , Roh, Jeongkyun (Department of Electrical Engineering, Pusan National University) , Kwak, Jeonghun (Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center (ISRC), Seoul National University)

Abstract ▼ AI-Helper

Colloidal quantum dots (QDs) have gained tremendous attention as a key material for highly advanced display technologies. The performance of QD light-emitting diodes (QLEDs) has improved significantly over the past two decades, owing to notable progress in both material development and device engineering. The brightness of QLEDs has improved by more than three orders of magnitude from that of early-stage devices, and has attained a value in the range of traditional inorganic LEDs. The emergence of high-luminance (HL) QLEDs has induced fresh demands to incorporate the unique features of QDs into a wide range of display applications, beyond indoor and mobile displays. Therefore it is necessary to assess the present status and prospects of HL-QLEDs, to expand the application domain of QD-based light sources. As part of this study, we review recent advances in HL-QLEDs. In particular, based on reports of brightness exceeding 105 cd/㎡, we have summarized the major approaches toward achieving high brightness in QLEDs, in terms of material development and device engineering. Furthermore, we briefly introduce the recent progress achieved toward QD laser diodes, being the next step in the development of HL-QLEDs. This review provides general guidelines for achieving HL-QLEDs, and reveals the high potential of QDs as a universal material solution that can enable realization of a wide range of display applications.

주제어

표/그림 (8)

그림 FIG. 1. (a) Display applications of QD-based light sources, with respect to required brightness. (b) Schematic of a standard QLED structure, and its energy-band diagram.
그림 FIG. 2. Development of peak brightness of red, green, and blue QLEDs over time.
표 TABLE 1. Summary of QLEDs with peak brightness of over 100,000 cd/m²
그림 FIG. 3. HL-QLEDs based on material modification.
그림 FIG. 4. (a) Chemical equation for efficient chlorination ligand-exchange process. X represents pseudohalides, sulfides, metal complexes, etc. The blue spheres and R denote CQD and aliphatic hydrocarbon groups respectively. (b) Current-densityluminance-voltage characteristics of the CdSe/ZnS/ZnS core/shell/shell (C/S/S) and C/S/S QDs with chlorination (C/S/S-Cl) -based QLEDs. Adapted with permission from [8]. (c) Chemical structures of oleic acid (OA) and 2-ethylhexane-1-thiol (EHT), and PL QYs of EHT-QDs in solution and solid film. (d) Current-density-luminance-voltage characteristics of QLEDs with OA or EHT surface ligands.
그림 FIG. 5. HL-QLEDs based on device engineering.
그림 FIG. 6. HL-QLEDs adopting novel structures.
그림 FIG. 7. Quantum-dot-based laser diodes.

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동의어: Packet Collision Rate

용어 설명 출처 목록 (6)

용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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