Functional Pyrimidinyl Pyrazolate Pt(II) Complexes: Role of Nitrogen Atom in Tuning the Solid-State Stacking and Photophysics

Paramaguru Ganesan; Wen-Yi Hung; Jen-Yung Tso; Chang-Lun Ko; Tsai-Hui Wang; Po-Ting Chen; Hsiu-Fu Hsu; Shih-Hung Liu; Gene-Hsiang Lee; Pi-Tai Chou; Alex K.-Y. Jen; Yun Chi

doi:10.1002/adfm.201900923

Functional Pyrimidinyl Pyrazolate Pt(II) Complexes: Role of Nitrogen Atom in Tuning the Solid-State Stacking and Photophysics

Paramaguru Ganesan, Wen-Yi Hung^*, Jen-Yung Tso, Chang-Lun Ko, Tsai-Hui Wang, Po-Ting Chen, Hsiu-Fu Hsu^*, Shih-Hung Liu, Gene-Hsiang Lee, Pi-Tai Chou^*, Alex K.-Y. Jen^*, Yun Chi^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

59 Citations (Scopus)

Abstract

Pt(II) metal complexes are known to exhibit strong solid-state aggregation and are promising for realization of efficient emission in fabrication of organic light emitting diodes (OLED) with nondoped emitter layer. Four pyrimidine–pyrazolate based chelates, together with four isomeric Pt(II) metal complexes, namely: [Pt(pm2z)₂], [Pt(tpm2z)₂], [Pt(pm4z)₂], and [Pt(tpm4z)₂], are isolated and systematically investigated for their structure–property relationships for practical OLED applications. Detailed single molecular and aggregated structures are revealed by photophysical and mechanochromic measurements, grazing-incidence X-ray diffraction, and theoretical approaches. These results suggest that these Pt(II) emitters pack like a deck of playing cards under vacuum deposition, and their emission energy is not only affected by the single molecular designs, but notably influenced by their intermolecular packing interaction, i.e., Pt···Pt separations that are arranged in the order: [Pt(tpm4z)₂] > [Pt(pm4z)₂] > [Pt(tpm2z)₂] > [Pt(pm2z)₂]. Nondoped OLED with emission ranging from green to red are prepared, to which the best performances are recorded for [Pt(tpm2z)₂], giving maximum external quantum efficiency (EQE) of 27.5% at 10³ cd m⁻², maximum luminance of 2.5 × 10⁵ cd m⁻² at 17 V, and with stable CIE_x_, _y of (0.56, 0.44).

Original language	English
Article number	1900923
Journal	Advanced Functional Materials
Volume	29
Issue number	26
Online published	6 May 2019
DOIs	https://doi.org/10.1002/adfm.201900923
Publication status	Published - 27 Jun 2019

Research Keywords

aggregation
organic light emitting diodes
phosphorescent
platinum
stacking interaction

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Ganesan, P., Hung, W.-Y., Tso, J.-Y., Ko, C.-L., Wang, T.-H., Chen, P.-T., Hsu, H.-F., Liu, S.-H., Lee, G.-H., Chou, P.-T., Jen, A. K.-Y., & Chi, Y. (2019). Functional Pyrimidinyl Pyrazolate Pt(II) Complexes: Role of Nitrogen Atom in Tuning the Solid-State Stacking and Photophysics. Advanced Functional Materials, 29(26), Article 1900923. https://doi.org/10.1002/adfm.201900923

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title = "Functional Pyrimidinyl Pyrazolate Pt(II) Complexes: Role of Nitrogen Atom in Tuning the Solid-State Stacking and Photophysics",

abstract = "Pt(II) metal complexes are known to exhibit strong solid-state aggregation and are promising for realization of efficient emission in fabrication of organic light emitting diodes (OLED) with nondoped emitter layer. Four pyrimidine–pyrazolate based chelates, together with four isomeric Pt(II) metal complexes, namely: [Pt(pm2z)2], [Pt(tpm2z)2], [Pt(pm4z)2], and [Pt(tpm4z)2], are isolated and systematically investigated for their structure–property relationships for practical OLED applications. Detailed single molecular and aggregated structures are revealed by photophysical and mechanochromic measurements, grazing-incidence X-ray diffraction, and theoretical approaches. These results suggest that these Pt(II) emitters pack like a deck of playing cards under vacuum deposition, and their emission energy is not only affected by the single molecular designs, but notably influenced by their intermolecular packing interaction, i.e., Pt···Pt separations that are arranged in the order: [Pt(tpm4z)2] > [Pt(pm4z)2] > [Pt(tpm2z)2] > [Pt(pm2z)2]. Nondoped OLED with emission ranging from green to red are prepared, to which the best performances are recorded for [Pt(tpm2z)2], giving maximum external quantum efficiency (EQE) of 27.5% at 103 cd m−2, maximum luminance of 2.5 × 105 cd m−2 at 17 V, and with stable CIEx, y of (0.56, 0.44).",

keywords = "aggregation, organic light emitting diodes, phosphorescent, platinum, stacking interaction",

author = "Paramaguru Ganesan and Wen-Yi Hung and Jen-Yung Tso and Chang-Lun Ko and Tsai-Hui Wang and Po-Ting Chen and Hsiu-Fu Hsu and Shih-Hung Liu and Gene-Hsiang Lee and Pi-Tai Chou and Jen, {Alex K.-Y.} and Yun Chi",

year = "2019",

month = jun,

day = "27",

doi = "10.1002/adfm.201900923",

language = "English",

volume = "29",

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TY - JOUR

T1 - Functional Pyrimidinyl Pyrazolate Pt(II) Complexes

T2 - Role of Nitrogen Atom in Tuning the Solid-State Stacking and Photophysics

AU - Ganesan, Paramaguru

AU - Hung, Wen-Yi

AU - Tso, Jen-Yung

AU - Ko, Chang-Lun

AU - Wang, Tsai-Hui

AU - Chen, Po-Ting

AU - Hsu, Hsiu-Fu

AU - Liu, Shih-Hung

AU - Lee, Gene-Hsiang

AU - Chou, Pi-Tai

AU - Jen, Alex K.-Y.

AU - Chi, Yun

PY - 2019/6/27

Y1 - 2019/6/27

N2 - Pt(II) metal complexes are known to exhibit strong solid-state aggregation and are promising for realization of efficient emission in fabrication of organic light emitting diodes (OLED) with nondoped emitter layer. Four pyrimidine–pyrazolate based chelates, together with four isomeric Pt(II) metal complexes, namely: [Pt(pm2z)2], [Pt(tpm2z)2], [Pt(pm4z)2], and [Pt(tpm4z)2], are isolated and systematically investigated for their structure–property relationships for practical OLED applications. Detailed single molecular and aggregated structures are revealed by photophysical and mechanochromic measurements, grazing-incidence X-ray diffraction, and theoretical approaches. These results suggest that these Pt(II) emitters pack like a deck of playing cards under vacuum deposition, and their emission energy is not only affected by the single molecular designs, but notably influenced by their intermolecular packing interaction, i.e., Pt···Pt separations that are arranged in the order: [Pt(tpm4z)2] > [Pt(pm4z)2] > [Pt(tpm2z)2] > [Pt(pm2z)2]. Nondoped OLED with emission ranging from green to red are prepared, to which the best performances are recorded for [Pt(tpm2z)2], giving maximum external quantum efficiency (EQE) of 27.5% at 103 cd m−2, maximum luminance of 2.5 × 105 cd m−2 at 17 V, and with stable CIEx, y of (0.56, 0.44).

AB - Pt(II) metal complexes are known to exhibit strong solid-state aggregation and are promising for realization of efficient emission in fabrication of organic light emitting diodes (OLED) with nondoped emitter layer. Four pyrimidine–pyrazolate based chelates, together with four isomeric Pt(II) metal complexes, namely: [Pt(pm2z)2], [Pt(tpm2z)2], [Pt(pm4z)2], and [Pt(tpm4z)2], are isolated and systematically investigated for their structure–property relationships for practical OLED applications. Detailed single molecular and aggregated structures are revealed by photophysical and mechanochromic measurements, grazing-incidence X-ray diffraction, and theoretical approaches. These results suggest that these Pt(II) emitters pack like a deck of playing cards under vacuum deposition, and their emission energy is not only affected by the single molecular designs, but notably influenced by their intermolecular packing interaction, i.e., Pt···Pt separations that are arranged in the order: [Pt(tpm4z)2] > [Pt(pm4z)2] > [Pt(tpm2z)2] > [Pt(pm2z)2]. Nondoped OLED with emission ranging from green to red are prepared, to which the best performances are recorded for [Pt(tpm2z)2], giving maximum external quantum efficiency (EQE) of 27.5% at 103 cd m−2, maximum luminance of 2.5 × 105 cd m−2 at 17 V, and with stable CIEx, y of (0.56, 0.44).

KW - aggregation

KW - organic light emitting diodes

KW - phosphorescent

KW - platinum

KW - stacking interaction

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U2 - 10.1002/adfm.201900923

DO - 10.1002/adfm.201900923

M3 - RGC 21 - Publication in refereed journal

SN - 1616-301X

VL - 29

JO - Advanced Functional Materials

JF - Advanced Functional Materials

IS - 26

M1 - 1900923

ER -

Functional Pyrimidinyl Pyrazolate Pt(II) Complexes: Role of Nitrogen Atom in Tuning the Solid-State Stacking and Photophysics

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Research Keywords

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