Supporting information. High-performance CsPbX 3 Perovskite Quantum Dot. Light Emitting Devices via Solid-state Ligand. Exchange

Transcription

1 Supporting information High-performance CsPbX 3 Perovskite Quantum Dot Light Emitting Devices via Solid-state Ligand Exchange Yo-Han Suh, Taeyun Kim, Jin Woo Choi, Chang-Lyoul Lee,*, and Jongnam Park*, School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology (UNIST) UNIST-gil 50, Ulsan, 44919, Republic of Korea jnpark@unist.ac.kr Advanced Photonics Research Institute (APRI) Gwangju Institute of Science and Technology (GIST) Cheomdan-gwagiro 123, Buk-gu, Gwangju, 61005, Republic of Korea vsepr@gist.ac.kr S-1

2 Figure S1. (a) Tendency of the LASA treatment for PeQDs, and (b) the photographs of SLE - treated PeQDs film before and after immersing in octane and benzene co-solvents, demonstrating the stability of PeQD film with short chain ligands. Figure S2. X-ray diffraction (XRD) characterization. XRD patterns of (a) red emitting CsPbI 3 PeQDs, green emitting CsPbBr 3 PeQDs, and blue-emitting CsPbClBr 2 PeQDs. (b) XRD patterns of green emitting CsPbBr 3 PeQDs before and after ligand exchange with short chain ligands. Long chain ligands are oleic acid and oleylamine, and short chain ligands are benzoic acid and 4- phenylbutylamine. For the characterization of the specific phase state, we compared the peak intensity rather than FWHM. S-2

3 Figure S3. Perovskite quantum dot size characterization. TEM images of (a) red emitting CsPbI 3 PeQDs, (b) green emitting CsPbBr 3 PeQDs, and (c) blue-emitting CsPbClBr 2 PeQDs. Figure S4. Atomic force microscopy images of CsPbBr 3 thin film (a) without SLE, and (b) with SLE treatment (5% condition). Scanning electron microscopy images of CsPbBr 3 thin film (c) without SLE, and (d) with SLE treatment (5% condition). S-3

4 Figure S5. Fluorescence microscopy image of (a) the without SLE treated CsPbBr 3 film and (b) SLE treated CsPbBr 3 film. [red circle : pinhole site] Figure S6. Vacuum test of PeQDs with various alkyl chain ligands. (a) UV Vis absorption spectrum of CsPbBr 3 PeQDs with alkyl chain ligands, and photoluminescence spectrum of CsPbBr 3 PeQDs with alkyl chain ligands (b) before vacuum treatment, and (c) after vacuum treatment. S-4

5 Figure S7. Vacuum test of PeQDs with various aromatic short ligands. (a) UV Vis absorption spectrum of CsPbBr 3 PeQDs with aromatic short ligands, and photoluminescence spectrum of CsPbBr 3 PeQDs with aromatic short ligands (b) before vacuum treatment, and (c) after vacuum treatment. S-5

6 Figure S8. Vacuum test of green emitting CsPbBr 3 PeQDs with various ligands. Photoluminescence properties of green-emitting PeQDs with ligands of various chain lengths before and after vacuum treatment. (a) Aniline, (b) Phenethylamine, (c) 4-Phenylbutylamine, and (d) Oleylamine S-6

7 Figure S9. PeQDs device characterization based on red emitting CsPbI 3 PeQDs. (a) Luminance/voltage characterization, (b) current efficiency, (c) J-V curves of various PeQDs subjected to SLE with various ligand ratio, and (d) CV curves and luminance as a function of ligand content for red emitting CsPbI 3 PeQDs. S-7

8 Figure S10. PeQDs device characterization based on blue emitting CsPbClBr 2 PeQDs. (a) Luminance/voltage characterization, (b) current efficiency, (c) J-V curves of various PeQDs subjected to SLE with various ligand ratio, and (d) CV curves and luminance as a function of ligand content for blue emitting CsPbClBr 2 PeQDs. S-8

9 Figure S11. Hole only device results using the SLE treated PeQDs with (a) 1.25%, (b) 2.5% and (c) 5% amount of short chain ligands during SLE. The hole only device structure was composed of the ITO/PEDOT:PSS/SLE-QDs/MoO 3 /Ag Table S1 Carrier mobility of each SLE condition. (0% condition is not available because too much current leakage occurred) 0% 1.25% 2.5% 5% 7.5% cm 2 /Vs N/A 2.2x x x10-5 Shortage S-9