Issue 43, 2021

Solid-state near infrared emitting platinum(ii) complexes as either an ultrathin or singly doped phosphorescence emitting layer in hybrid white OLEDs exhibiting high efficiency and colour rendering index

Abstract

Two solid-state near infrared (NIR) emitting platinum complexes, PBSNND and AtFNND, have been employed together with classical blue fluorescent 4P-NPD in the fabrication of hybrid white OLEDs. Through an ultrathin emitting layer approach, we have successfully achieved a dual emission, yellow and deep red/NIR electroluminescence (EL) for the PBSNND-based hybrid WOLEDs. The ideal EL performance was obtained from a hybrid WOLED with a 1.0 nm ultrathin phosphorescence emitting layer and a layer of 4P-NPD (2.5 nm) in front of TPBI, the electron transporting layer of the device (Hyb W1). The Hyb W1 exhibited a warm white EL, CIEx,y (0.41, 0.31), a high colour rendering index (CRI) of 86, and an external quantum efficiency (EQE) as high as 12.9%. Dissimilarly, when a singly doped phosphorescence emitting layer was adopted, a dual emission, green and deep red/NIR electroluminescence (EL) was obtained for the AtFNND-based hybrid WOLEDs. With an AtFNND dopant concentration of 5 or 7 wt%, a purplish blue white EL, CIEx,y (0.30, 0.31), a high colour rendering index (CRI) of 84, and an external quantum efficiency (EQE) as high as 10.5%; an authentic white EL, CIEx,y (0.35, 0.32), a very high colour rendering index (CRI) of 88, and an external quantum efficiency (EQE) as high as 13.7% have been achieved for device Hyb W2 and Hyb W3, respectively.

Graphical abstract: Solid-state near infrared emitting platinum(ii) complexes as either an ultrathin or singly doped phosphorescence emitting layer in hybrid white OLEDs exhibiting high efficiency and colour rendering index

Article information

Article type
Paper
Submitted
01 srp 2021
Accepted
08 ruj 2021
First published
09 ruj 2021

J. Mater. Chem. C, 2021,9, 15470-15476

Solid-state near infrared emitting platinum(II) complexes as either an ultrathin or singly doped phosphorescence emitting layer in hybrid white OLEDs exhibiting high efficiency and colour rendering index

H. T. Kidanu and C. Chen, J. Mater. Chem. C, 2021, 9, 15470 DOI: 10.1039/D1TC03068J

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