Electroluminescence from singlet excited-state of the exciplex between (2,3-Dicarbonitrilopyrazino[2,3-f][1,10]phenanthroline)Re(CO)3Cl and CBP

Document Type

Article

Publication Date

3-13-2008

Abstract

(2,3-Dicarbonitrilopyrazino[2,3-f] [1,10]phenanthroline)Re(CO) 3Cl (Dicnpp-Re) is synthesized successfully, and the photophysics, the electrochemistry, and the thermogravimetric analysis are performed to study the properties of Dicnpp-Re. It is found that the exciplex with λmax at ∼620 nm can be formed between CBP and Dicnpp-Re, and the exciplex emission is confirmed to be from the singlet excited state of the bound CBP and Dicnpp-Re molecules by the measurement of the lifetime of the CBP/Dicnpp-Re film. Color-tunable EL devices based on a host material of CBP and a dopant material of Dicnpp-Re are fabricated. A CBP/Dicnpp-Re (3%) based EL device emits white light with CIE coordinates of (x = 0.35, y = 0.32). The spectrum consists of three discrete bands centered at 380 nm from CBP, 560 nm from the characteristic 3MLCT state of Dicnpp-Re, and 620 nm from the exciplex between Dicnpp-Re and CBP. When the doping concentration is 16%, the EL spectrum mainly demonstrates the red exciplex emission with CIE coordinates of (x = 0.57, y = 0.33). © 2008 American Chemical Society.

Publication Source (Journal or Book title)

Journal of Physical Chemistry C

First Page

3920

Last Page

3925

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