文章信息/Info

Title:

Recent Advances in Light Manipulation for Organic Light-Emitting Diodes

作者:

 歐清東; 唐建新

蘇州大學功能納米與軟物質研究院 蘇州納米科技協同創新中心

Author(s):

OU Qingdong;  TANG Jianxin

Institute of Functional Nano & Soft Materials, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University

關鍵詞:

有機發光器件; 光學調控; 光取出

DOI:

10.7502/j.issn.1674-3962.2016.08.07

文獻標志碼:

A

摘要:

有機發光器件已經在全彩顯示屏、可穿戴設備以及環境友好的室內照明領域獲得了越來越高的關注度。近年來，材料設計、器件結構、以及制備工藝的革新，推動OLED器件性能在大面積、高效率、長壽命和高顯色指數方面取得了一系列突破性的進展。光學耦合效率是影響OLED器件的光電轉換過程的關鍵因素之一，如何調控光學耦合、避免器件內部的光子流失、提高出光效率，對于發展高效率高穩定OLED技術具有重要意義。本文將圍繞光學調控技術在波長依賴性、出光角度敏感性以及制備工藝兼容性方面，系統分析OLED器件中光學損耗機制，探討近年來國內外在OLED的微納結構光學調控的研究進展，并介紹最新發展的軟納米壓印仿生微納結構光學耦合調控方法。此光調控技術實現了綠光OLED器件效率達到366 cd/A、白光OLED效率達到123.4 lm/W、柔性白光OLED效率達到106 lm/W，為新型OLED的光學調控提供了新思路。

Abstract:

Organic light-emitting diodes (OLEDs) have gained increasing significance in applications of full-color display panels, wearable intelligent electronics, and eco-friendly interior lighting. Recently, the innovation of material design, device structure, and manufacturing technology has enabled OLED device performance to reach a new stage in terms of large area, long lifetime, high efficiency and color rendering index. Light out-coupling plays a critical role in determining the efficiency of electron-photon conversion processes, so it is of great importance in developing efficient and stable OLEDs to optically manipulating light generated and avoiding intrinsic mode loss. In this review, we emphasize the strategies of light manipulation from the perspective of wavelength dependency, angle sensitivity, and compatibility with device fabrication. Various optical loss channels are analyzed first. Recent developments of mico/nanostructure-stimulated light out-coupling for OLEDs are then overviewed. At last, we introduce our newly developed light manipulation technique using bio-inspired moth-eye nanostructures via soft nanoimprint lithography. This technique enables extremely high current efficiency of 366 cd A-1 for green OLED, power efficiencies of 123.4 lm W-1 and 106 lm W-1 for glass and plastic based white OLEDs respectively, which is expected to help accelerate the commercialization of large-scale and low-cost OLED panels and provide scientific inspiration to advanced device architecture design.