Narrowband and Pure Violet Organic Emitter with a Full Width at Half Maximum of 14 nm and <i>y</i> Color Coordinate of Below 0.02
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- Ha Lim Lee
- School of Chemical Engineering Sungkyunkwan University 2066 Seobu‐ro, Jangan‐gu Suwon‐si Gyeonggi‐do 16419 Korea
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- Won Jae Chung
- School of Chemical Engineering Sungkyunkwan University 2066 Seobu‐ro, Jangan‐gu Suwon‐si Gyeonggi‐do 16419 Korea
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- Jun Yeob Lee
- School of Chemical Engineering Sungkyunkwan University 2066 Seobu‐ro, Jangan‐gu Suwon‐si Gyeonggi‐do 16419 Korea
抄録
<jats:title>Abstract</jats:title><jats:p>Violet organic light‐emitting diodes (OLEDs) with a very narrow emission spectrum with a full width at half maximum of 14 nm and <jats:italic>y</jats:italic> color coordinate of 0.02 are developed using a indolo[3,2,1‐<jats:italic>jk</jats:italic>]carbazole‐derived pure violet emitter. The violet emitter, 2,5,13,16‐tetra‐<jats:italic>tert</jats:italic>‐butylindolo[3,2,1‐<jats:italic>jk</jats:italic>]‐indolo[1′,2′,3′:1,7]indolo[2,3‐<jats:italic>b</jats:italic>]carbazole (tDIDCz), is designed to have a very rigid molecular structure driven by the multiresonance‐type core structure through the alternating carbon and nitrogen atoms. The violet emitter is decorated with <jats:italic>t</jats:italic>‐butyl groups to prevent intermolecular aggregation and packing, which allow pure violet emission without excimer emission. The violet OLEDs derived from the tDIDCz emitter show a violet color coordinate of (0.164, 0.018) with a narrow emission spectrum and a full width at half maximum of 14 nm (105 meV). The external quantum efficiency of the pure violet OLEDs is 3.3%. This is the first work reporting pure violet emission without any ultraviolet emission below 380 nm and blue emission above 450 nm by showing a very narrow emission spectrum.</jats:p>
収録刊行物
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- Small
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Small 16 (14), 2020-03-12
Wiley