Triplet Excited-State Engineering of Phosphorescent Pt(II) Complexes

Yipei Wu; Xiao Tan; Anqi Lv; Feiling Yu; Huili Ma; Kang Shen; Zhengyi Sun; Fei Chen; Zhi Kuan Chen; Xiao Chun Hang

doi:10.1021/acs.jpclett.9b01685

Triplet Excited-State Engineering of Phosphorescent Pt(II) Complexes

Yipei Wu
, Xiao Tan
, Anqi Lv
, Feiling Yu
, Huili Ma^*
, Kang Shen
, Zhengyi Sun
, Fei Chen
, Zhi Kuan Chen
, Xiao Chun Hang

^*Corresponding author for this work

Research output: Journal Publication › Article › peer-review

49 Citations (Scopus)

Abstract

Three Pt(II) complexes, Pt(czpyOczpy), Pt(czpyOczpy-Me), and Pt(czpyOczpy-OMe), are designed to elucidate the inherent relationship between electronically excited-state and photo- and electroluminescent properties. These complexes showed a blue-shifted phosphorescence with a narrowing spectral profile, which are interrelated with the variation of T₁ states from the ³MLCT, hybridized ³(MLCT/LC) to ³LC transition. This change is ascribed to the destabilization of LUMO energy levels on the pyridinyl site, leading to more electron distribution on the carbazolide unit in T₁. Moreover, the solution-processed device of Pt(czpyOczpy-OMe), featuring a ³LC transition, shows the best color purity of blue light. Compared to the device of Pt(czpyOczpy) with ³MLCT character, the device of Pt(czpyOczpy-Me) with hybridized ³(MLCT/LC) exhibits improved color purity and external quantum efficiency (10.2%) at a luminance of 1000 cd/m². Therefore, this work gives a mechanistic interpretation of the phosphorescent properties of tetradentate Pt(II) complexes derived from the manageable lowest triplet excited states.

Original language	English
Pages (from-to)	5105-5110
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	10
Issue number	17
DOIs	https://doi.org/10.1021/acs.jpclett.9b01685
Publication status	Published - 5 Sept 2019

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SDG 7 Affordable and Clean Energy

ASJC Scopus subject areas

General Materials Science
Physical and Theoretical Chemistry

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10.1021/acs.jpclett.9b01685

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@article{a941b9547e4a406b8e008ba9000ceebb,

title = "Triplet Excited-State Engineering of Phosphorescent Pt(II) Complexes",

abstract = "Three Pt(II) complexes, Pt(czpyOczpy), Pt(czpyOczpy-Me), and Pt(czpyOczpy-OMe), are designed to elucidate the inherent relationship between electronically excited-state and photo- and electroluminescent properties. These complexes showed a blue-shifted phosphorescence with a narrowing spectral profile, which are interrelated with the variation of T1 states from the 3MLCT, hybridized 3(MLCT/LC) to 3LC transition. This change is ascribed to the destabilization of LUMO energy levels on the pyridinyl site, leading to more electron distribution on the carbazolide unit in T1. Moreover, the solution-processed device of Pt(czpyOczpy-OMe), featuring a 3LC transition, shows the best color purity of blue light. Compared to the device of Pt(czpyOczpy) with 3MLCT character, the device of Pt(czpyOczpy-Me) with hybridized 3(MLCT/LC) exhibits improved color purity and external quantum efficiency (10.2\%) at a luminance of 1000 cd/m2. Therefore, this work gives a mechanistic interpretation of the phosphorescent properties of tetradentate Pt(II) complexes derived from the manageable lowest triplet excited states.",

author = "Yipei Wu and Xiao Tan and Anqi Lv and Feiling Yu and Huili Ma and Kang Shen and Zhengyi Sun and Fei Chen and Chen, \{Zhi Kuan\} and Hang, \{Xiao Chun\}",

note = "Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = sep,

day = "5",

doi = "10.1021/acs.jpclett.9b01685",

language = "English",

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journal = "Journal of Physical Chemistry Letters",

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T1 - Triplet Excited-State Engineering of Phosphorescent Pt(II) Complexes

AU - Wu, Yipei

AU - Tan, Xiao

AU - Lv, Anqi

AU - Yu, Feiling

AU - Ma, Huili

AU - Shen, Kang

AU - Sun, Zhengyi

AU - Chen, Fei

AU - Chen, Zhi Kuan

AU - Hang, Xiao Chun

PY - 2019/9/5

Y1 - 2019/9/5

N2 - Three Pt(II) complexes, Pt(czpyOczpy), Pt(czpyOczpy-Me), and Pt(czpyOczpy-OMe), are designed to elucidate the inherent relationship between electronically excited-state and photo- and electroluminescent properties. These complexes showed a blue-shifted phosphorescence with a narrowing spectral profile, which are interrelated with the variation of T1 states from the 3MLCT, hybridized 3(MLCT/LC) to 3LC transition. This change is ascribed to the destabilization of LUMO energy levels on the pyridinyl site, leading to more electron distribution on the carbazolide unit in T1. Moreover, the solution-processed device of Pt(czpyOczpy-OMe), featuring a 3LC transition, shows the best color purity of blue light. Compared to the device of Pt(czpyOczpy) with 3MLCT character, the device of Pt(czpyOczpy-Me) with hybridized 3(MLCT/LC) exhibits improved color purity and external quantum efficiency (10.2%) at a luminance of 1000 cd/m2. Therefore, this work gives a mechanistic interpretation of the phosphorescent properties of tetradentate Pt(II) complexes derived from the manageable lowest triplet excited states.

AB - Three Pt(II) complexes, Pt(czpyOczpy), Pt(czpyOczpy-Me), and Pt(czpyOczpy-OMe), are designed to elucidate the inherent relationship between electronically excited-state and photo- and electroluminescent properties. These complexes showed a blue-shifted phosphorescence with a narrowing spectral profile, which are interrelated with the variation of T1 states from the 3MLCT, hybridized 3(MLCT/LC) to 3LC transition. This change is ascribed to the destabilization of LUMO energy levels on the pyridinyl site, leading to more electron distribution on the carbazolide unit in T1. Moreover, the solution-processed device of Pt(czpyOczpy-OMe), featuring a 3LC transition, shows the best color purity of blue light. Compared to the device of Pt(czpyOczpy) with 3MLCT character, the device of Pt(czpyOczpy-Me) with hybridized 3(MLCT/LC) exhibits improved color purity and external quantum efficiency (10.2%) at a luminance of 1000 cd/m2. Therefore, this work gives a mechanistic interpretation of the phosphorescent properties of tetradentate Pt(II) complexes derived from the manageable lowest triplet excited states.

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SN - 1948-7185

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JO - Journal of Physical Chemistry Letters

JF - Journal of Physical Chemistry Letters

IS - 17

ER -

Triplet Excited-State Engineering of Phosphorescent Pt(II) Complexes

Abstract

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