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Efficient Green Phosphorescent Organic Light Emitting Diode using Iridium Complex

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Title Efficient Green Phosphorescent Organic Light Emitting Diode using Iridium Complex
 
Creator Tripathi, Aparna
Kumar, Pankaj
 
Subject Organic light emitting diodes
Electroluminescence
Phosphorescent Iridium complex
Dexter energy transfer
Host-Guest system
 
Description 415-421
We report here the fabrication and characterization of an efficient green phosphorescent organic light emitting diodes
(PhOLED) using phosphorescent iridium complex, tris(2-phenylpyridine) iridium (III) (Ir(ppy)3). Ir(ppy)3 is an organic
phosphorescent material, which emits green light via both the singlet as well as triplet exciton relaxation. To avoid triplettriplet
annihilation and for efficient light emission, the phosphorescent emitters should be doped in a suitable host material
which has band-gap larger than the doped guest material and the band gap of the guest should lie within the band-gap of the
host. We optimally doped phosphorescent Ir(ppy)3 into a fluorescent 4,4'-bis(9-carbazolyl) biphenyl (CBP) host and used it
as the emitter to prepare PhOLEDs. The PhOLED exhibited green electroluminescence (EL) in the range ~ 480-650 nm with
EL peak at 550 nm along with a shoulder at 510 nm. The Commission Internationale de-I’eclairage (CIE) colour coordinate
of the device was measured to be (0.25, 0.60). The current density vs voltage vs luminescence (J-V-L) characteristics of the
device led us to calculate its current efficiency, which was found to be 28.9 cd/A at 7V. The efficiency of PhOLED
decreased with increment in the applied voltage beyond 7 V and has been attributed to the triplet-triplet annihilation due to
high injected current densities.
 
Date 2022-05-13T09:12:46Z
2022-05-13T09:12:46Z
2022-05
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscair.res.in/handle/123456789/59709
 
Language en
 
Publisher CSIR-NIScPR, India
 
Source IJPAP Vol.60(05) [May 2022]