1
|
Shen X, Kwak SL, Jeong WH, Jang JW, Yu Z, Ahn H, Park HJ, Choi H, Park SH, Snaith HJ, Hwang DH, Lee BR. Thermal Management Enables Stable Perovskite Nanocrystal Light-Emitting Diodes with Novel Hole Transport Material. Small 2023; 19:e2303472. [PMID: 37420329 DOI: 10.1002/smll.202303472] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/08/2023] [Indexed: 07/09/2023]
Abstract
The severely insufficient operational lifetime of perovskite light-emitting diodes (LEDs) is incompatible with the rapidly increasing external quantum efficiency, even as it approaches the theoretical limit, thereby significantly impeding the commercialization of perovskite LEDs. In addition, Joule heating induces ion migration and surface defects, degrades the photoluminescence quantum yield and other optoelectronic properties of perovskite films, and induces the crystallization of charge transport layers with low glass transition temperatures, resulting in LED degradation under continuous operation. Here, a novel thermally crosslinked hole transport material, poly(FCA60 -co-BFCA20 -co-VFCA20 ) (poly-FBV), with temperature-dependent hole mobility is designed, which is advantageous for balancing the charge injection of the LEDs and limiting the generation of Joule heating. The optimised CsPbI3 perovskite nanocrystal LEDs with poly-FBV realise approximately a 2-fold external quantum efficiency increase over the LED with commercial hole transport layer poly(4-butyl-phenyl-diphenyl-amine) (poly-TPD), owing to the balanced carrier injection and suppressed exciton quenching. Moreover, because of the Joule heating control provided by the novel crosslinked hole transport material, the LED utilising crosslinked poly-FBV has a 150-fold longer operating lifetime (490 min) than that utilizing poly-TPD (3.3 min). The study opens a new avenue for the use of PNC LEDs in commercial semiconductor optoelectronic devices.
Collapse
Affiliation(s)
- Xinyu Shen
- Department of Physics, CECS Research Institute, and Core Research Institute, Pukyong National University, Busan, 48513, Republic of Korea
- Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Seon Lee Kwak
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Woo Hyeon Jeong
- Department of Chemistry, Research Institute for Convergence of Basic Sciences, and Research Institute for Natural Science, Hanyang University, Seoul, 04763, Republic of Korea
| | - Ji Won Jang
- Department of Chemistry, Research Institute for Convergence of Basic Sciences, and Research Institute for Natural Science, Hanyang University, Seoul, 04763, Republic of Korea
| | - Zhongkai Yu
- Department of Physics, CECS Research Institute, and Core Research Institute, Pukyong National University, Busan, 48513, Republic of Korea
| | - Hyungju Ahn
- Pohang Accelerator Laboratory, POSTECH, Pohang, 37673, Republic of Korea
| | - Hea Jung Park
- Department of Biology and Chemistry, Changwon National University, Changwon, 51140, Republic of Korea
| | - Hyosung Choi
- Department of Chemistry, Research Institute for Convergence of Basic Sciences, and Research Institute for Natural Science, Hanyang University, Seoul, 04763, Republic of Korea
| | - Sung Heum Park
- Department of Physics, CECS Research Institute, and Core Research Institute, Pukyong National University, Busan, 48513, Republic of Korea
| | - Henry J Snaith
- Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, OX1 3PU, UK
| | - Do-Hoon Hwang
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan, 46241, Republic of Korea
| | - Bo Ram Lee
- Department of Physics, CECS Research Institute, and Core Research Institute, Pukyong National University, Busan, 48513, Republic of Korea
| |
Collapse
|
2
|
Park JY, Kwak SL, Park HJ, Hwang DH. Indolocarbazole-Based Photo-Crosslinkable Hole-Transporting Layer for Efficient Solution-Processed Organic Light-Emitting Diodes. Nanomaterials (Basel) 2023; 13:1934. [PMID: 37446451 DOI: 10.3390/nano13131934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 06/18/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023]
Abstract
We designed and synthesized a new indolocarbazole-based polymer, poly(N,N-diphenyl(5,11-dihexylindolo[3,2,1-jk]carbazol-2-yl)amine) (PICA), for solution-processed organic light-emitting diodes (OLEDs). The highest occupied and lowest unoccupied molecular orbital energy levels of this polymer, -5.25 and -2.46 eV, respectively, are suitable for hole transport from the anode to the emissive layer. PICA was photo-crosslinked by UV irradiation with ethane-1,2-diyl bis(4-azido-2,3,5,6-tetrafluorobenzoate) (FPA) as the photoinitiator. Successful crosslinking was confirmed by a decreased intensity in the azide-stretching FT-IR peak and solvent test with toluene (a suitable solvent for PICA). The PICA film photo-crosslinked with 3 wt% FPA showed enhanced solvent resistance (90%) compared to the non-crosslinked neat PICA film (<20%). Moreover, OLED devices using PICA-based hole-transporting layers exhibited better device performance (EQE/LE/PE: 8.88%/12.97/8.12 in red devices, 10.84%/38.47 cd/A/25.06 lm/W in green devices) than those using poly-TPD:FPA. We demonstrated that the photo-crosslinked PICA can be applied as a hole-transporting layer in solution-processed OLEDs.
Collapse
Affiliation(s)
- Jeong Yong Park
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Seon Lee Kwak
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Hea Jung Park
- Department of Biology and Chemistry, Changwon National University, Changwon 51140, Republic of Korea
| | - Do-Hoon Hwang
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| |
Collapse
|
3
|
Park JY, Jang JW, Shen X, Jang JH, Kwak SL, Choi H, Lee BR, Hwang DH. Fluorene- and arylamine-based photo-crosslinkable hole transporting polymer for solution-processed perovskite and organic light-emitting diodes. Macromol Res 2023. [DOI: 10.1007/s13233-023-00151-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
|
4
|
Jadhav AM, Park HJ, Jang J, Park JY, Kwak SL, Hwang D. New green phosphorescent Ir(
III
) complex with carbazolylbenzimidazole ligand for
solution‐processed
organic light‐emitting diode. B KOREAN CHEM SOC 2021. [DOI: 10.1002/bkcs.12435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Amol Maruti Jadhav
- Department of Chemistry and Chemistry Institute for Functional Materials Pusan National University Busan Republic of Korea
| | - Hea Jung Park
- Department of Chemistry and Chemistry Institute for Functional Materials Pusan National University Busan Republic of Korea
| | - Jae‐Ho Jang
- Department of Chemistry and Chemistry Institute for Functional Materials Pusan National University Busan Republic of Korea
| | - Jeong Yong Park
- Department of Chemistry and Chemistry Institute for Functional Materials Pusan National University Busan Republic of Korea
| | - Seon Lee Kwak
- Department of Chemistry and Chemistry Institute for Functional Materials Pusan National University Busan Republic of Korea
| | - Do‐Hoon Hwang
- Department of Chemistry and Chemistry Institute for Functional Materials Pusan National University Busan Republic of Korea
| |
Collapse
|