Control of Spontaneous Orientation Polarization of Host Layers in Organic Light-Emitting Diodes

Gerardus N. Iswara Lestanto; Shunta Kakumachi; Youichi Tsuchiya; Hajime Nakanotani; Chin-Yiu Chan; Chihaya Adachi

doi:10.1021/acsami.5c19743

Control of Spontaneous Orientation Polarization of Host Layers in Organic Light-Emitting Diodes

Gerardus N. Iswara Lestanto
, Shunta Kakumachi
, Youichi Tsuchiya
, Hajime Nakanotani^*
, Chin-Yiu Chan^*
, Chihaya Adachi^*

^*Corresponding author for this work

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

Abstract

Spontaneous orientation polarization (SOP), arising from the partial alignment of permanent dipole moments in organic thin films, is regarded as a crucial factor in enhancing the performance of organic optoelectronic devices. In this study, organic host materials, DPCzBN1, DPCzBN2, and DPCzBN3, were synthesized, and their SOP properties were analyzed. An unusual negative SOP was observed in the DPCzBN3 film, while its counterparts, DPCz, DPCzBN1, and DPCzBN2, showed positive SOP. Further, we found that doping emitter molecules into the DPCz derivatives had an adverse effect on negatively polarized SOP. This finding highlights the significant role of dipole–dipole interactions and glass transition temperature (T_g)-dependent molecular kinetic energy in determining SOP in codeposited films. © 2026 American Chemical Society

Original language	English
Pages (from-to)	8485-8492
Number of pages	8
Journal	ACS Applied Materials & Interfaces
Volume	18
Issue number	5
Online published	26 Jan 2026
DOIs	https://doi.org/10.1021/acsami.5c19743
Publication status	Published - 11 Feb 2026

Funding

This work was partially supported financially by the Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Numbers 23H05406, 23K17367, 24KJ1804, and 23K20039. In addition, this work was also financially supported by City University of Hong Kong (Project No. 9610637).

Research Keywords

spontaneous orientation polarization
giantsurfacepotential
permanent dipole moment
organic light-emittingdiodes
OLED operational stability

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title = "Control of Spontaneous Orientation Polarization of Host Layers in Organic Light-Emitting Diodes",

abstract = "Spontaneous orientation polarization (SOP), arising from the partial alignment of permanent dipole moments in organic thin films, is regarded as a crucial factor in enhancing the performance of organic optoelectronic devices. In this study, organic host materials, DPCzBN1, DPCzBN2, and DPCzBN3, were synthesized, and their SOP properties were analyzed. An unusual negative SOP was observed in the DPCzBN3 film, while its counterparts, DPCz, DPCzBN1, and DPCzBN2, showed positive SOP. Further, we found that doping emitter molecules into the DPCz derivatives had an adverse effect on negatively polarized SOP. This finding highlights the significant role of dipole–dipole interactions and glass transition temperature (Tg)-dependent molecular kinetic energy in determining SOP in codeposited films. {\textcopyright} 2026 American Chemical Society",

keywords = "spontaneous orientation polarization, giantsurfacepotential, permanent dipole moment, organic light-emittingdiodes, OLED operational stability",

author = "Lestanto, \{Gerardus N. Iswara\} and Shunta Kakumachi and Youichi Tsuchiya and Hajime Nakanotani and Chin-Yiu Chan and Chihaya Adachi",

year = "2026",

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language = "English",

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TY - JOUR

T1 - Control of Spontaneous Orientation Polarization of Host Layers in Organic Light-Emitting Diodes

AU - Lestanto, Gerardus N. Iswara

AU - Kakumachi, Shunta

AU - Tsuchiya, Youichi

AU - Nakanotani, Hajime

AU - Chan, Chin-Yiu

AU - Adachi, Chihaya

PY - 2026/2/11

Y1 - 2026/2/11

N2 - Spontaneous orientation polarization (SOP), arising from the partial alignment of permanent dipole moments in organic thin films, is regarded as a crucial factor in enhancing the performance of organic optoelectronic devices. In this study, organic host materials, DPCzBN1, DPCzBN2, and DPCzBN3, were synthesized, and their SOP properties were analyzed. An unusual negative SOP was observed in the DPCzBN3 film, while its counterparts, DPCz, DPCzBN1, and DPCzBN2, showed positive SOP. Further, we found that doping emitter molecules into the DPCz derivatives had an adverse effect on negatively polarized SOP. This finding highlights the significant role of dipole–dipole interactions and glass transition temperature (Tg)-dependent molecular kinetic energy in determining SOP in codeposited films. © 2026 American Chemical Society

AB - Spontaneous orientation polarization (SOP), arising from the partial alignment of permanent dipole moments in organic thin films, is regarded as a crucial factor in enhancing the performance of organic optoelectronic devices. In this study, organic host materials, DPCzBN1, DPCzBN2, and DPCzBN3, were synthesized, and their SOP properties were analyzed. An unusual negative SOP was observed in the DPCzBN3 film, while its counterparts, DPCz, DPCzBN1, and DPCzBN2, showed positive SOP. Further, we found that doping emitter molecules into the DPCz derivatives had an adverse effect on negatively polarized SOP. This finding highlights the significant role of dipole–dipole interactions and glass transition temperature (Tg)-dependent molecular kinetic energy in determining SOP in codeposited films. © 2026 American Chemical Society

KW - spontaneous orientation polarization

KW - giantsurfacepotential

KW - permanent dipole moment

KW - organic light-emittingdiodes

KW - OLED operational stability

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U2 - 10.1021/acsami.5c19743

DO - 10.1021/acsami.5c19743

M3 - RGC 21 - Publication in refereed journal

SN - 1944-8244

VL - 18

SP - 8485

EP - 8492

JO - ACS Applied Materials & Interfaces

JF - ACS Applied Materials & Interfaces

IS - 5

ER -

Control of Spontaneous Orientation Polarization of Host Layers in Organic Light-Emitting Diodes

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