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<strong>Efficient Green Phosphorescent Organic Light Emitting Diode using Iridium Complex</strong>

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Title Statement <strong>Efficient Green Phosphorescent Organic Light Emitting Diode using Iridium Complex</strong>
 
Added Entry - Uncontrolled Name Tripathi, Aparna ; Department of Applied Sciences, National Institute of Technology Delhi, New Delhi-110040, India
Kumar, Pankaj ; CSIR-National Physical Laboratory, Dr. K. S. Krishnan Marg, New Delhi-110 012, India
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Uncontrolled Index Term specific instrumentation and techniques of general use in physics
Organic light emitting diodes; Electroluminescence; Phosphorescent Iridium complex; Dexter energy transfer; Host-Guest system
 
Summary, etc. 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.
 
Publication, Distribution, Etc. Indian Journal of Pure & Applied Physics (IJPAP)
2022-05-10 10:37:11
 
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http://op.niscair.res.in/index.php/IJPAP/article/view/59238
 
Data Source Entry Indian Journal of Pure & Applied Physics (IJPAP); ##issue.vol## 60, ##issue.no## 5 (2022): Indian Journal of Pure & Applied Physics
 
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