Efficient non-doped blue organic light-emitting diodes: donor–acceptor type host materials

Jayaraman Jayabharathi,Pavadai Nethaji,Palanisamy Sujatha,Venugopal Thanikachalam,Palanivel Jeeva

doi:10.1039/c7ra11732a

Jayaraman Jayabharathi, Pavadai Nethaji + Show 3 more

Open Access

https://doi.org/10.1039/c7ra11732a

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Journal: RSC advances	Publication Date: Jan 1, 2017
Citations: 4	License type: CC BY 3.0

Affiliation: Annamalai University

Abstract

Blue devices with phenanthroimidazole OMeNPI-PITPA show maximum efficiencies ηex 4.90%; ηc 5.90 cd A−1 and are used as hosts for green OLEDs.

Highlights

Organic light-emitting diodes (OLEDs) are of current interest from both scienti c and practical points of view due to their potential utility in high-resolution at-panel displays.[1,2,3,4,5] The development of efficient green[6,7,8] and red devices[9] with pure color Commission International de l'Eclairage (CIE) coordination has been well reported
Our continuous interest to design and synthesize the ntype imidazole derivatives as OLED emitters to improve the efficiencies of devices,[22,23,24,25,26,27,28,29,30,31] we report the synthesis of a series of blue-emitting (E)-40-(1-(4-(2-(1-(naphthalen-1-yl)-1Hphenanthro[9,10-d]imidazol-2-yl)vinyl)phenyl)-1H-phenanthro [9,10-d]imidazol-2-yl)-N,N-diphenyl-[1,10]-biphenyl]-4-amine derivatives and their application as the emitter in nondoped devices and host materials for green OLEDs
We have reported the efficient newborn deep blue emitting materials NPI-PITPA, MeNPI-PITPA and OMeNPI-PITPA with D–A geometry exhibit dual charge transport properties and show excellent thermal properties with high glass-transition temperature

Summary

Introduction

Organic light-emitting diodes (OLEDs) are of current interest from both scienti c and practical points of view due to their potential utility in high-resolution at-panel displays.[1,2,3,4,5] The development of efficient green[6,7,8] and red devices[9] with pure color Commission International de l'Eclairage (CIE) coordination has been well reported. Though blue phosphorescent devices with high external quantum efficiencies have been reported, due to short device lifetimes they are not yet commercially used.[10,11,12,13] to commercialise efficient blue OLEDs there is an urgent need to develop blue emissive materials. These derivatives show higher thermal stability, proper carries barriers and balanced charge injection property

Materials and measurements

Theoretical calculations

Devices fabrication

Photophysical properties

Conclusion