Details

Autor(en) / Beteiligte

• Yang, Meizhu
• Tan, Ji-Hua
• Xing, Longjiang
• Qiu, Zhipeng
• Cao, Chen
• Chen, Wen-Cheng
• Yang, Qin-Dan
• Ji, Shaomin
• Huo, Yanping
• Lee, Chun-Sing

Titel

A sterically shielded design on anthracene-based emitters for efficient deep-blue organic light-emitting diodes

Ist Teil von

• Journal of molecular structure, 2021-05, Vol.1232, p.130035, Article 130035

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2021

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• •Two sterically shielded anthracene derivatives are developed with modification of peripheral phenyl groups (PPGs).•The influence of PPGs decoration on the photoluminescence and electroluminescence properties is studied to unveil the structure-property relationship.•PPGs can significantly suppress electronic coupling in solid state due to its steric-demanding geometry•High efficiency with EQE of up to 5.05% and deep-blue electroluminescence with color index of (0.15, 0.09) are demonstrated. Two new anthracene derivatives are designed with a sterically shielded strategy for deep-blue electroluminescence applications. The naphthyl groups of the widely used blue emitter 9,10-di-(2-naphthyl)anthracene (ADN) were modified with four peripheral phenyl groups (PPGs) to enhance intermolecular spacing in solid-state thin film for suppressing electronic coupling. Influence of the PPGs decoration on photoluminescence and electroluminescence are investigated to reveal the structure-property relationship. A nondoped organic light-emitting diode with the new emitter 9-(naphthalen-2-yl)-10-(5,6,7,8-tetraphenylnaphthalen-2-yl)anthracene (M1) exhibits excellent performance with a maximum external quantum efficiency of 5.05% and deep-blue color index of (0.15, 0.09). Although the use of bulky peripheral substituents does improve device performance, it should be paid attention to the non-conductive effect induced by the larger molecular spacing in the design of deep-blue electroluminescence materials. This work provides a promising molecular design for deep-blue electroluminescence materials. [Display omitted]