2026 Bernard Geffroy: Materials Science Researcher – H-Index, Publications & Awards

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Materials Science	43	12412	12003	391	376	223	5950

Overview

Bernard Geffroy is affiliated with École Polytechnique in France and has contributed extensively to materials science and engineering fields. Their research spans multiple disciplines with a focus on materials chemistry and electrical and electronic engineering.

The primary fields of study in Geffroy's work include:

Materials Science
Engineering

The subfields where Geffroy has most frequently published are:

Materials Chemistry
Electrical and Electronic Engineering
Polymers and Plastics
Organic Chemistry
Inorganic Chemistry

Key research topics addressed in Geffroy's publications include:

Crystallization and Solubility Studies
X-ray Diffraction in Crystallography
Perovskite Materials and Applications
Organic Light-Emitting Diodes Research
Luminescence and Fluorescent Materials
Chalcogenide Semiconductor Thin Films
Organic Electronics and Photovoltaics

The scientist has published several recent papers, highlighting advances in optoelectronic materials and device applications. Selected works include:

"Reversible Photoinduced Phase Segregation and Origin of Long Carrier Lifetime in Mixed-Halide Perovskite Films," 2020, Advanced Functional Materials
"A highly efficient solution and solid state ESIPT fluorophore and its OLED application," 2021, New Journal of Chemistry
"Universal host materials for red, green and blue high-efficiency single-layer phosphorescent organic light-emitting diodes," 2020, Journal of Materials Chemistry C
"Tuning the aggregation behaviour of BN-coronene diimides with imide substituents and their performance in devices (OLEDs and OFETs)," 2021, Journal of Materials Chemistry C
"Synthesis, Electronic Properties and OLED Devices of Chromophores Based on λ⁵-Phosphinines," 2020, Chemistry - A European Journal

Among frequent coauthors collaborating with Geffroy are:

Denis Tondelier
Muriel Hissler
Pierre-Antoine Bouit
Thomas Delouche
Thierry Roisnel

The venues where this scientist has most frequently published their work include:

The Cambridge Structural Database
Journal of Materials Chemistry C
New Journal of Chemistry
Advanced Functional Materials
Chemistry - A European Journal

Best Publications

Organic light-emitting diode (OLED) technology: materials, devices and display technologies

Bernard Geffroy;Philippe le Roy;Christophe Prat

1280
Citations
Design and Synthesis of New Circularly Polarized Thermally Activated Delayed Fluorescence Emitters

Sophie Feuillastre;Mathilde Pauton;Longhui Gao;Alaric Desmarchelier

350
Citations
Structural Instabilities Related to Highly Anharmonic Phonons in Halide Perovskites.

Arthur Marronnier;Heejae Lee;Bernard Geffroy;Jacky Even

178
Citations
ortho-, meta-, and para-dihydroindenofluorene derivatives as host materials for phosphorescent OLEDs.

Maxime Romain;Sébastien Thiery;Anna Shirinskaya;Céline Declairieux

155
Citations
Tunable Organophosphorus Dopants for Bright White Organic Light‐Emitting Diodes with Simple Structures

Omrane Fadhel;Michael Gras;Noella Lemaitre;Valérie Deborde

118
Citations
Implementation of submicrometric periodic surface structures toward improvement of organic-solar-cell performances

C. Cocoyer;L. Rocha;L. Sicot;B. Geffroy

117
Citations
A H2-evolving photocathode based on direct sensitization of MoS3 with an organic photovoltaic cell.

Tiphaine Bourgeteau;Denis Tondelier;Bernard Geffroy;Bernard Geffroy;Romain Brisse

105
Citations
Dependence of the Properties of Dihydroindenofluorene Derivatives on Positional Isomerism: Influence of the Ring Bridging

Maxime Romain;Denis Tondelier;Jean-Charles Vanel;Bernard Geffroy

101
Citations
Spirobifluorene Regioisomerism: A Structure–Property Relationship Study

Lambert Sicard;Cassandre Quinton;Jean-David Peltier;Denis Tondelier

100
Citations
White organic light-emitting diodes with fine chromaticity tuning via ultrathin layer position shifting

Hakim Choukri;Alexis Fischer;Sébastien Forget;Sébastien Chénais

89
Citations
Properties modulation of organic semi-conductors based on a donor-spiro-acceptor (D-spiro-A) molecular design: new host materials for efficient sky-blue PhOLEDs

Maxime Romain;Denis Tondelier;Olivier Jeannin;Bernard Geffroy

88
Citations
Solution, solid state, and film properties of a structurally characterized highly luminescent molecular europium plastic material excitable with visible light.

Gaël Zucchi;Vajjiravel Murugesan;Denis Tondelier;Dmitry Aldakov

87
Citations
9,9'-Spirobifluorene and 4-phenyl-9,9'- spirobifluorene: pure hydrocarbon small molecules as hosts for efficient green and blue PhOLEDs

Sébastien Thiery;Denis Tondelier;Céline Declairieux;Gijun Seo

86
Citations
4-Pyridyl-9,9'-spirobifluorenes as Host Materials for Green and Sky-Blue Phosphorescent OLEDs

Sébastien Thiery;Denis Tondelier;Céline Declairieux;Bernard Geffroy

81
Citations
White Organic Light‐Emitting Diodes Based on Quench‐Resistant Fluorescent Organophosphorus Dopants

Damien Joly;Denis Tondelier;Valérie Deborde;Wylliam Delaunay

81
Citations
Donor/Acceptor Dihydroindeno[1,2-a]fluorene and Dihydroindeno[2,1-b]fluorene: Towards New Families of Organic Semiconductors.

Maxime Romain;Denis Tondelier;Bernard Geffroy;Olivier Jeannin

78
Citations
Phosphole-based π-conjugated electroluminescent materials for OLEDs

Damien Joly;Denis Tondelier;Valérie Deborde;Bernard Geffroy

77
Citations
Electron-Rich 4-Substituted Spirobifluorenes: Toward a New Family of High Triplet Energy Host Materials for High-Efficiency Green and Sky Blue Phosphorescent OLEDs

Cassandre Quinton;Sébastien Thiery;Olivier Jeannin;Denis Tondelier

77
Citations
Spiro-configured phenyl acridine thioxanthene dioxide as a host for efficient PhOLEDs

Maxime Romain;Denis Tondelier;Bernard Geffroy;Anna Shirinskaya

75
Citations
Spirobifluorene-2,7-dicarbazole-4'-phosphine Oxide as Host for High-Performance Single-Layer Green Phosphorescent OLED Devices.

Sébastien Thiery;Denis Tondelier;Bernard Geffroy;Emmanuel Jacques

72
Citations
Reversible Photoinduced Phase Segregation and Origin of Long Carrier Lifetime in Mixed-Halide Perovskite Films

Subodh K. Gautam;Minjin Kim;Douglas R. Miquita;Douglas R. Miquita;Jean‐Eric Bourée

68
Citations