• Advanced Photonics
  • Vol. 4, Issue 1, 014001 (2022)
Jianyu Zhang1、†, Xueqian Zhao1, Hanchen Shen1, Jacky W. Y. Lam1, Haoke Zhang2、3、4、*, and Ben Zhong Tang1、4、5、6、*
Author Affiliations
  • 1The Hong Kong University of Science and Technology, Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, and Guangdong-Hong Kong-Macau Joint Laboratory of Optoelectronic and Magnetic Functional Materials, Clear Water Bay, Kowloon, Hong Kong, China
  • 2Zhejiang University, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Hangzhou, China
  • 3ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, China
  • 4South China University of Technology, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, Guangzhou, China
  • 5The Chinese University of Hong Kong, Shenzhen Institute of Aggregate Science and Technology, School of Science and Engineering, Shenzhen, China
  • 6AIE Institute, Guangzhou Development District, Guangzhou, China
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    DOI: 10.1117/1.AP.4.1.014001 Cite this Article
    Jianyu Zhang, Xueqian Zhao, Hanchen Shen, Jacky W. Y. Lam, Haoke Zhang, Ben Zhong Tang. White-light emission from organic aggregates: a review[J]. Advanced Photonics, 2022, 4(1): 014001 Copy Citation Text show less

    Abstract

    White light, which contains polychromic visible components, affects the rhythm of organisms and has the potential for advanced applications of lighting, display, and communication. Compared with traditional incandescent bulbs and inorganic diodes, pure organic materials are superior in terms of better compatibility, flexibility, structural diversity, and environmental friendliness. In the past few years, polychromic emission has been obtained based on organic aggregates, which provides a platform to achieve white-light emission. Several white-light emitters are sporadically reported, but the underlying mechanistic picture is still not fully established. Based on these considerations, we will focus on the single-component and multicomponent strategies to achieve efficient white-light emission from pure organic aggregates. Thereinto, single-component strategy is introduced from four parts: dual fluorescence, fluorescence and phosphorescence, dual phosphorescence with anti-Kasha’s behavior, and clusteroluminescence. Meanwhile, doping, supramolecular assembly, and cocrystallization are summarized as strategies for multicomponent systems. Beyond the construction strategies of white-light emitters, their advanced representative applications, such as organic light-emitting diodes, white luminescent dyes, circularly polarized luminescence, and encryption, are also prospected. It is expected that this review will draw a comprehensive picture of white-light emission from organic aggregates as well as their emerging applications.

    Video Introduction to the Article

    1 Introduction

    Light has illuminated the world and promoted the development of society, especially since Thomas Edison invented incandescent lightbulbs in 1879. Natural sunlight contains different wavelengths of light within the visible spectrum and finally shows white color. It affects the metabolism of humans and controls the circadian rhythm of organisms.1 To mimic natural sunlight, steps on the exploration of white-light luminescent materials have never stopped. They have exhibited a wide range of lighting applications in illumination, industry automotive, information communication, and luminescent dyes. Compared with traditional incandescent lightbulbs and inefficient mercury-discharge-based fluorescent lamps, solid-state sources such as LEDs exhibit advantages such as high efficacy, small size, color stability, controllability, and variability, thus attracting increasing attention from scientists and industries.24 Being different from traditional light sources with monochromatic light, white-light emitters should produce polychromatic lights simultaneously, which usually requires them to have di-, tri-, or tetrachromatic sources.2,3,5 For example, white-light LEDs with high brightness and durability could be realized by synergistically combining traditional LED with three primary colors (e.g., blue InGaN LED, green InGaN LED, and red GaAlAs LED).6 Other strategies based on ultraviolet/blue LED plus phosphors have been successfully utilized.79 The past several decades have witnessed a prosperous era in the generation and commercialization of white-light emitters based on inorganic semiconductor p-n junction diodes and phosphors.

    Jianyu Zhang, Xueqian Zhao, Hanchen Shen, Jacky W. Y. Lam, Haoke Zhang, Ben Zhong Tang. White-light emission from organic aggregates: a review[J]. Advanced Photonics, 2022, 4(1): 014001
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