Professor Yun CHI received his bachelor degree from National Tsing Hua University in 1978 and doctoral degree under Prof. John R. Shapley from University of Illinois at Urbana-Champaign in 1986. After spending one year as postdoctoral fellow, he joined the Department of Chemistry, National Tsing Hua University as associate professor in 1987 and promoted to professor in 1991. He was awarded the Academic Award and the National Chair Professorship of Taiwan in 2006 and in 2011, and Permanent National Chair Professorship in 2016. Prizes/Honours MOE Scholastic Prize from National Research Council of Taiwan (2006) NSC/NRC Eminent Researcher (2008). Academic Award of the Ministry of Education of Taiwan (2006). National Chair Professor of Taiwan (2011-2014). Chair Professor of Y. Z. Hsu Memorial Foundation (2013). Elected Academician of the Asia Pacific Academy of Materials (2013). Scholastic Medal of the Chinese Chemical Society in Taipei (2014). Permanent National Chair Professor of Taiwan (2016-2018).

Prof CHI’s current research interests were focused on the photophysical and opto-electrical properties of organic and organometallic materials, design of transition-metal phosphors for organic light emitting diodes (OLEDs) and evaluation of sensitizers and hole transporting materials for dye sensitized solar cells (DSSC) and Perovskite solar cells (PSC)

Blue electroluminescence and hyperluminescence facilitated by Ir(III) phosphors with 5-cyano-imidazo[4,5-b]pyridin-2-ylidene cyclometalates Wu, Y., Tong, K.-N., Kuhn, M., Wu, C., Hung, W.-Y., Wei, G. & Yan, J. & 2 others, , 21 Feb 2025, In: Journal of Materials Chemistry C. 13, 7, p. 3501-3510 10 p. Blue-Emitting Iridium(III) Carbene Phosphors with Suppressed Efficiency Roll-Off and Enhanced Durability of Hyper-OLED Devices Yan, J., Wu, C., Yiu, S.-M., Kuhn, M., Huang, M., Zhang, Y. & Zhou, X. & 3 others, , 29 Nov 2024 In: Advanced Optical Materials. 2402332.Check@CityULib Blue hyperphosphorescence based on green Ir(III) sensitizer with dual CF3 substituted imidazo [4,5-c]pyridin-2-ylidene cyclometalates Yan, J., Xin, Y., Pan, Y., Ni, G., Yiu, S.-M., Chi, Y. & Duan, L. & 1 others, , Nov 2024, In: Synthetic Metals. 308, 117734. Pt(II) phosphors with dual 1,6-naphthyridin-5-yl pyrazolate chelates and non-doped organic light emitting diodes Wang, S.-F., Wu, C.-C., Chou, P.-T., Kung, Y.-C., Hung, W.-Y., Yu, C.-J. & Yeh, C.-H. & 3 others, , 28 Oct 2024, In: Journal of Materials Chemistry C. 12, 40, p. 16608-16616 Tetradentate Pt(II) Complexes Based on Xylenylamino Linked Dual Pyrazolate Chelates for Organic Light Emitting Diodes Zhou, F., Pan, Y., Hung, W.-Y., Chen, C.-F., Chen, K.-M., Li, J.-L. & Yiu, S.-M. & 4 others, , 17 Oct 2024, In: Chemistry - A European Journal. 30, 58, e202402636.Check@CityULib Enhanced Emitting Dipole Orientation Based on Asymmetric Iridium(III) Complexes for Efficient Saturated-Blue Phosphorescent OLEDs Shi, K., Wu, C., Zhang, H., Tong, K.-N., He, W., Li, W. & Jin, Z. & 10 others, , 16 Oct 2024, In: Advanced Science. 11, 38, 2402349. Tuning the circularly polarized phosphorescence of platinum(ii) complexes through a chiral cation strategy Ren, J., He, T., Lu, H., Wang, H., Shao, T., Wang, Z. & Zhang, Y. & 5 others, , 12 Sept 2024 In: Materials Horizons.Check@CityULib Metal Carbene Complex And Its Use CHI, Y. (Inventor), YAN, J. (Inventor) & WU, Y. (Inventor), 15 Aug 2024, (Filed) Priority No. 18/805,695 Ir(III) Metal Emitters with Cyano-Modified Imidazo[4,5-b]pyridin-2-ylidene Chelates for Deep-Blue Organic Light-Emitting Diodes Wu, Y., Xin, Y., Pan, Y., Yiu, S. M. K., Yan, J., Lau, K. C. & Duan, L. & 1 others, , 10 Jul 2024, In: Advanced Science. 11, 26, 2309389. Blue electroluminescence from homoleptic Ir(III) carbene phosphors and peripheral decorated multiple resonance boron emitters Yan, J., Nakamura, T., Tan, X., Yiu, S.-M., Mimura, R., Hoshi, K. & Zhou, X. & 3 others, , 15 May 2024, In: Chemical Engineering Journal. 488, 150791. Blue Electrophosphorescence from Iridium(III) Phosphors Bearing Asymmetric Di‐N‐Aryl 6‐(trifluoromethyl)‐2H‐imidazo[4,5‐b]pyridin‐2‐ylidene Chelates Yan, J., Feng, Z.-Q., Wu, Y., Zhou, D.-Y., Yiu, S.-M., Chan, C.-Y. & Pan, Y. & 3 others, , 25 Apr 2024, In: Advanced Materials. 38, 17, 2305273. Selective syntheses of homoleptic Ir(iii) complexes bearing di-CF3-functionalized benzoimidazol-2-ylidenes for generation of blue phosphorescence Yan, J., Pan, Y., Peng, I.-C., Hung, W.-Y., Hu, B., Ni, G. & Yiu, S.-M. & 2 others, , 21 Apr 2024, In: Inorganic Chemistry Frontiers. 11, 8, p. 2413-2426 Lithographic convex pattern as a wavelength-independent light extraction structure for efficient organic light-emitting diodes Qu, Z.-H., Wang, Y., Song, M., Liu, W.-Z., Yan, J., Meng, S.-G. & Li, M.-T. & 4 others, , 14 Mar 2024, In: Journal of Materials Chemistry C. 12, 10, p. 3474-3481 Effects of Deuterium Isotopes on Pt(II) Complexes and Their Impact on Organic NIR Emitters Wang, S.-F., Zhou, D.-Y., Kuo, K.-H., Wang, C.-H., Hung, C.-M., Yan, J. & Liao, L.-S. & 3 others, , 4 Mar 2024, In: Angewandte Chemie - International Edition. 63, 10, e202317571. Design strategies of iridium(III) complexes for highly efficient saturated blue phosphorescent OLEDs with improved lifetime Wu, C., Shi, K., Li, S., Yan, J., Feng, Z.-Q., Tong, K.-N. & Zhang, S.-W. & 6 others, , Mar 2024, In: EnergyChem. 6, 2, 100120. Red and Near Infrared Emissive Bis-Tridentate Ir(III) Phosphors for Organic Light Emitting Diodes Yan, J., Song, M., Zhou, D.-Y., Ni, G., Gu, M., Yiu, S.-M. & Zhou, X. & 2 others, , 13 Feb 2024, In: Advanced Optical Materials. 12, 5, 2301739. Bis-tridentate Ir(III) Phosphors and Blue Hyperphosphorescence with Suppressed Efficiency Roll-Off at High Brightness Yan, J., Qu, Z.-H., Zhou, D.-Y., Yiu, S.-M., Qin, Y., Zhou, X. & Liao, L.-S. & 1 others, , 24 Jan 2024, In: ACS Applied Materials and Interfaces. 16, 3, p. 3809-3818 Structural Engineering of Iridium(III) Phosphors with Imidazo[4,5-b]pyrazin-2-ylidene Cyclometalates for Efficient Blue Electroluminescence Yan, J., Wu, C., Tong, K.-N., Zhou, F., Chen, Y., Pan, Y. & Xie, G. & 3 others, , 7 Jan 2024 In: Small Methods. 2301555. Iridium(III) Carbene Phosphors with Fast Radiative Transitions for Blue Organic Light Emitting Diodes and Hyperphosphorescence Zheng, Z., Wang, L., Xin, Y., Wang, Q., Hong, X., Zhang, Y. & Yiu, S.-M. & 5 others, , 3 Jan 2024 In: Advanced Functional Materials. 2311692. High-performance near-infrared OLEDs maximized at 925 nm and 1022 nm through interfacial energy transfer Hung, C.-M., Wang, S.-F., Chao, W.-C., Li, J.-L., Chen, B.-H., Lu, C.-H. & Tu, K.-Y. & 4 others, , 2024, In: Nature Communications. 15, 4664. Homoleptic iridium(III) carbene complexes as efficient blue OLED phosphors? Chi, Y. & Yan, J., 2024, PROCEEDINGS OF SPIE: Organic and Hybrid Light Emitting Materials and Devices XXVIII. SPIE, Vol. 13122. 1312218. (Proceedings of SPIE - The International Society for Optical Engineering).Check@CityULib Wearable and Wavelength-Tunable Near-Infrared Organic Light-Emitting Diodes for Biomedical Applications Cho, E. H., Choi, H.-R., Park, Y., Jeong, S. Y., Song, Y. J., Hwang, Y. H. & Lee, J. & 5 others, , 13 Dec 2023, In: ACS Applied Materials & Interfaces. 15, 49, p. 57415-57426 Peripheral engineering of Ir(iii) emitters with imidazo[4,5-b]pyrazin-2-ylidene cyclometalates for blue organic light emitting diodes Yan, J., Wu, Y., Peng, I.-C., Pan, Y., Yiu, S.-M., Wong, K.-T. & Hung, W.-Y. & 2 others, , 28 Sept 2023, In: Journal of Materials Chemistry C. 11, 36, p. 12270-12279 Peripheral engineering of platinum(II) dicarbene pincer complexes for efficient blue hyperphosphorescent organic light-emitting diodes Zhu, Z.-L., Yan, J., Fu, L.-W., Cao, C., Tan, J.-H., Wang, S.-F. & Chi, Y. & 1 others, , 21 Aug 2023, In: Materials Chemistry Frontiers. 7, 16, p. 3398-3405 Charge-Neutral Ir(III) Metal Phosphors Bearing Functional Pyrazole-Pyridine-Pyrazole Chelates Yan, J., Song, M., Zhou, D.-Y., Yiu, S.-M., Liao, L.-S., Chi, Y. & Xie, M., 14 Aug 2023, In: Organometallics. 42, 15, p. 2070−2078 Copper Nanoparticles Enhancing Organic Light-Emitting Diodes of All Colors Lin, J.-T., Huang, C.-S., Hui, C. M., Liang, Y.-H., The, L., Lu, F.-H. & Chi, Y. & 3 others, , 23 Jun 2023, In: ACS Applied Nano Materials. 6, 12, p. 10487-10493 NIR OLEDs using NIR Emitters and Optical Effects for Wavelength Control in NIR Light Region Cho, E. H., Park, Y., Chi, Y. & Choi, K. C., Jun 2023, In: Digest of Technical Papers - SID International Symposium. 54, 1, p. 97-100 Engineering of Cyano Functionalized Benzo[d]imidazol-2-ylidene Ir(III) Phosphors for Blue Organic Light-Emitting Diodes Yan, J., Wang, S. F., Hsu, C.-H., Shi, E.H.-C., Wu, C.-C., Chou, P.-T. & Yiu, S.-M. & 4 others, , 3 May 2023, In: ACS Applied Materials and Interfaces. 15, 17, p. 21333–21343 Excited-State THz Vibrations in Aggregates of PtII Complexes Contribute to the Enhancement of Near-Infrared Emission Efficiencies Wei, Y.-C., Chen, B.-H., Ye, R.-S., Huang, H.-W., Su, J.-X., Lin, C.-Y. & Hodgkiss, J. & 6 others, , 11 Apr 2023, In: Angewandte Chemie (International Edition). 62, 16, p. e202300815 Efficient Near-Infrared Luminescence of Self-Assembled Platinum(II) Complexes: From Fundamentals to Applications Wei, Y.-C., Kuo, K.-H., Chi, Y. & Chou, P.-T., 21 Mar 2023, In: Accounts of Chemical Research. 56, 6, p. 689-699 Transition-metal phosphors with emission peak maximum on and beyond the visible spectral boundaries Ni, G., Yan, J., Wu, Y., Zhou, F., Chou, P.-T. & Chi, Y., 7 Mar 2023, In: Inorganic Chemistry Frontiers. 10, 5, p. 1395-1401 Electroluminescence and hyperphosphorescence from stable blue Ir(III) carbene complexes with suppressed efficiency roll-off Yan, J., Zhou, D.-Y., Liao, L.-S., Kuhn, M., Zhou, X., Yiu, S.-M. & Chi, Y., 2023, In: Nature Communications. 14, 6419. Facially Coordinated, Tris-bidentate Purin-8-ylidene Ir(III) Complexes for Blue Electrophosphorescence and Hyperluminescence Qin, Y., Yang, X., Jin, J., Li, D., Zhou, X., Zheng, Z. & Sun, Y. & 3 others, , 5 Dec 2022, In: Advanced Optical Materials. 10, 23, 2201633. Polyatomic molecules with emission quantum yields >20% enable efficient organic light-emitting diodes in the NIR(II) window Wang, S.-F., Su, B.-K., Wang, X.-Q., Wei, Y.-C., Kuo, K.-H., Wang, C.-H. & Liu, S.-H. & 9 others, , Dec 2022, In: Nature Photonics. 16, 12, p. 843–850 Near-Infrared OLEDs Based on Functional Pyrazinyl Azolate Os(II) Phosphors and Deuteration Peng, X., Yeh, C.-H., Wang, S. F., Yan, J., Gan, S., Su, S.-J. & Zhou, X. & 2 others, , 18 Oct 2022, In: Advanced Optical Materials. 10, 20, 2201291. Blue Phosphorescence and Hyperluminescence Generated from Imidazo[4,5-b]pyridin-2-ylidene-Based Iridium(III) Phosphors Yang, X., Zhou, X., Zhang, Y.-X., Li, D., Li, C., You, C. & Chou, T.-C. & 3 others, , 5 Sept 2022, In: Advanced Science. 9, 25, 2201150. Metal Complex And Light Emitting Device CHI, Y. (Inventor) & YAN, J. (Inventor), 22 Aug 2022, (Filed) Priority No. 17/892,250 Platinum Complex, Nitrogen-containing Bidentate Chelate, And Apparatus for Providing Visible Emission or Near-infrare Emission CHI, Y. (Inventor), 16 Aug 2022, Patent No. US11,414,447, Priority No. 17/148,583 Azolate-Based Osmium(II) Complexes with Luminescence Spanning Visible and Near Infrared Region Zhou, F., Gu, M. & Chi, Y., 19 Jul 2022, In: European Journal of Inorganic Chemistry. 2022, 20, e202200222. Iridium(III) Phosphors–Bearing Functional 9-Phenyl-7,9-dihydro-8H-purin-8-ylidene Chelates and Blue Hyperphosphorescent OLED Devices Jin, J., Zhu, Z., Yan, J., Zhou, X., Cao, C., Chou, P.-T. & Zhang, Y.-X. & 3 others, , Jul 2022, In: Advanced Photonics Research. 3, 7, 2100381. Efficient Blue Electrophosphorescence and Hyperphosphorescence Generated by Bis-tridentate Iridium(III) Complexes Zhu, Z.-L., Gnanasekaran, P., Yan, J., Zheng, Z., Lee, C.-S., Chi, Y. & Zhou, X., 13 Jun 2022, In: Inorganic Chemistry. 61, 23, p. 8898–8908 Regioselective Syntheses of Imidazo[4,5-b]pyrazin-2-ylidene-Based Chelates and Blue Emissive Iridium(III) Phosphors for Solution-Processed OLEDs Yan, J., Xue, Q., Yang, H., Yiu, S.-M., Zhang, Y.-X., Xie, G. & Chi, Y., 13 Jun 2022, In: Inorganic Chemistry. 61, 23, p. 8797-8805 An Iridium Complex And A Light Emitting Device Comprising The Same CHI, Y. (Inventor), GAN, L. (Inventor) & JIN, J. (Inventor), 13 May 2022, (Filed) Priority No. 17/743,543 Stepwise Access of Emissive Ir(III) Complexes Bearing a Multi-Dentate Heteroaromatic Chelate: Fundamentals and Applications Zheng, Z., Zhu, Z.-L., Ho, C.-L., Yiu, S.-M., Lee, C.-S., Suramitr, S. & Hannongbua, S. & 1 others, , 14 Mar 2022, In: Inorganic Chemistry. 61, 10, p. 4384–4393 Near-Infrared Thermally Activated Delayed Fluorescence Nanoparticle: A Metal-Free Photosensitizer for Two-Photon-Activated Photodynamic Therapy at the Cell and Small Animal Levels Fang, F., Yuan, Y., Wan, Y., Li, J., Song, Y., Chen, W.-C. & Zhao, D. & 4 others, , 10 Feb 2022, In: Small. 18, 6, 2106215. S Efficient Pyrazolo[5,4-f]quinoxaline Functionalized Os(II) Based Emitter with an Electroluminescence Peak Maximum at 811 nm Zhu, Z.-L., Wang, S.-F., Fu, L.-W., Tan, J.-H., Cao, C., Yuan, Y. & Yiu, S.-M. & 3 others, , 19 Jan 2022, In: Chemistry - A European Journal. 28, 4, e202103202. Homoleptic Ir(III) Phosphors with 2-Phenyl-1,2,4-triazol-3-ylidene Chelates for Efficient Blue Organic Light-Emitting Diodes You, C., Wang, X.-Q., Zhou, X., Yuan, Y., Liao, L.-S., Liao, Y.-C. & Chou, P.-T. & 1 others, , 15 Dec 2021, In: ACS Applied Materials and Interfaces. 13, 49, p. 59023-59034 Luminescence of Pyrazinyl Pyrazolate Pt(II) Complexes Fine-Tuned by the Solid-State Stacking Interaction Hung, W.-Y., Yu, C.-J., Fu, L.-W., Ko, C.-L., Su, B.-K., Liu, S.-H. & Kong, Y.-C. & 2 others, , 2 Dec 2021, In: Energy and Fuels. 35, 23, p. 19112-19122 Probing electron excitation characters of carboline-based bis-tridentate ir(III) complexes Yan, J., Zhu, Z.-L., Lee, C.-S., Liu, S.-H., Chou, P.-T. & Chi, Y., Oct 2021, In: Molecules. 26, 19, 6048. Phosphors Based On Carbene Metal Complex CHI, Y. (Inventor), YUAN, Y. (Inventor) & YOU, C. (Inventor), 2 Sept 2021, (Filed) Priority No. 17/465,604 High Performance NIR OLEDs with Low Efficiency Roll-Off by Leveraging Os(II) Phosphors and Exciplex Co-Host Zhu, Z.-L., Tan, J.-H., Chen, W.-C., Yuan, Y., Fu, L.-W., Cao, C. & You, C.-J. & 3 others, , 16 Aug 2021, In: Advanced Functional Materials. 31, 33, 2102787. Platinum(II) based phosphors and NIR organic light emitting diodes Chi, Y., Aug 2021, In: Digest of Technical Papers - SID International Symposium. 52, S2, p. 486Check@CityULib Revealing the role of 1,2,4-triazolate fragment of blue-emitting bis-tridentate Ir(III) phosphors: photophysical properties, photo-stabilities, and applications Zhu, Z.-L., Hsu, L.-Y., Tai, W.-S., Ni, S.-F., Lee, C.-S. & Chi, Y., Jun 2021, In: Materials Today Energy. 20, 100636. Platinum(II) based near-infrared phosphors for efficient organic light-emitting diodes with peak wavelength beyond 800 nm Chi, Y., May 2021, SOCIETY OF INFORMATION DISPLAY - 2021 INTERNATIONAL SYMPOSIUM: DIGEST OF TECHNICAL PAPERS: ORAL SESSIONS. p. 254-256 3 p. (Digest of Technical Papers - SID International Symposium; vol. 52, no. 1).Check@CityULib Rational Tuning of Bis-Tridentate Ir(III) Phosphors to Deep-Blue with High Efficiency and Sub-microsecond Lifetime Tai, W.-S., Gnanasekaran, P., Chen, Y.-Y., Hung, W.-Y., Zhou, X., Chou, T.-C. & Lee, G.-H. & 3 others, , 7 Apr 2021, In: ACS Applied Materials & Interfaces. 13, 13, p. 15437-15447 Constructing deep-blue bis-tridentate Ir(III) phosphors with fluorene-based dianionic chelates Zhu, Z.-L., Chen, W.-C., Ni, S.-F., Yan, J., Wang, S. F., Fu, L.-W. & Tsai, H.-Y. & 2 others, , 28 Jan 2021, In: Journal of Materials Chemistry C. 9, 4, p. 1318-1325 The Observation of Interchain Motion in Self-Assembled Crystalline Platinum(II) Complexes: An Exquisite Case but by No Means the only One in Molecular Solids Su, B.-K., Wei, Y.-C., Chuang, W.-T., Weng, S.-C., Wang, S.-F., Chen, D.-G. & Huang, Z.-X. & 2 others, , 2021, In: Journal of Physical Chemistry Letters. 12, p. 7482-7489 Formation of Excimers in Isoquinolinyl Pyrazolate Pt(II) Complexes: Role of Cooperativity Effects Sukpattanacharoen, C., Kumar, P., Chi, Y., Kungwan, N. & Escudero, D., 21 Dec 2020, In: Inorganic Chemistry. 59, 24, p. 18253–18263 Interlayer Charge Transfer Coupled with Acoustic Phonon in Organic/Inorganic van der Waals Stacked Heterostructures: Self-Assembled Pt(II) Complex on a PtSe2 Monolayer Shen, S.-W., Wei, Y.-C., Fu, F.-Y., Chou, K.-J., Wang, S.-F., Fu, L.-W. & Chuang, W.-T. & 5 others, , 19 Nov 2020, In: The Journal of Physical Chemistry C. 124, 46, p. 25538–25546