Studies on Organic Light Emitting Diodes Using Phenanthroline Derivatives as Emitters

Soyoung Pak; Jinho Park; Song Eun Lee; Young Kwan Kim; Seung Soo Yoon

doi:10.1166/jnn.2020.17232

Studies on Organic Light Emitting Diodes Using Phenanthroline Derivatives as Emitters

J Nanosci Nanotechnol. 2020 Jan 1;20(1):573-578. doi: 10.1166/jnn.2020.17232.

Authors

Soyoung Pak¹, Jinho Park¹, Song Eun Lee², Young Kwan Kim², Seung Soo Yoon¹

Affiliations

¹ Department of Chemistry, Sungkyunkwan University, Suwon, 440-746, Korea.
² Department of Information Display, Hongik University, Seoul, 121-791, Korea.

PMID: 31383213
DOI: 10.1166/jnn.2020.17232

Abstract

In this study, we designed and synthesized blue emitting materials based on 1, 10-phenanthroline derivatives. OLED devices using these materials were fabricated in the following sequence; indium-tin-oxide (ITO) (180 nm)/N,N'-diphenyl-N,N'-(2-napthyl)-(1,1'-phenyl)-4,4'-diamine (NPB) (50 nm)/Tris(4-carbazoyl-9-ylphenyl)amine (TCTA) (10 nm)/Blue materials (20 nm)/2,2',2″-(1,3, 5-Benzinetriyl)-tris(1-phenyl-1-H-benzimidazole) (TPBi) (30 nm)/lithium quinolate (Liq) (2 nm)/Al (100 nm). Particularly, a device using 2-(4-(9,9-dimethylacridin-10(9H)-yl)phenyl)-1-phenyl-1Himidazo[ 4,5-f][1,10] phenanthroline as a blue emitter showed the maximum values of luminous efficiency, power efficiency, and external quantum efficiency of 1.45 cd/A, 1.52 lm/W, 0.99%, respectively with the Commission Internationale d'Énclairage (CIE) (x,y) coordinates of (0.16, 0.14) at 8.0 V.