High‐Performance Organic Electroluminescence: Design from Organic Light‐Emitting Materials to Devices

Abstract

Organic electroluminescence is considered as the most competitive alternative for the future solid-state displays and lighting techniques owing to many advantages such as selfluminescence, high efficiency, high contrast, high color rendering index, ultra-thin thickness, transparency, flat and flexibility, etc. The development of high-performance organic electroluminescence has become the continuing focus of research. In this personal account, a brief overview of representative achievements in our study on the design of highly efficient novel organic light-emitting materials (including fluorescent materials, phosphorescent iridium(III) complexes and conjugated polymers bearing phosphorescent iridium(III) complex) and highperformance device structures together with working principles are given. At last, we will give some perspectives on this fascinating field, and also try to provide some potential directions of research on the basis of the current stage of organic electroluminescence. Wiley Online Library 1537 Scheme 5. The chemical structures of cationic iridium(III) complexes based on various N N ligands (18-23).Figure 7. UV-vis absorption (a) and PL (b) of 18-23 in CH 2 Cl 2 . [30] Figure 35. (a) The device structure and proposed working mechanism for WOLED with sandwiched blue EML; (b) The normalized EL spectra of WOLED at the voltage of 5-7 V, and corresponding luminance, CIE, CCT, and CRI are also given. [65a]

Synthesis and properties of hyperbranched polymers for white polymer light-emitting diodes

“…In these devise, ITO and Al are used as anode and cathode, respectively; PEDOT:PSS and TPBi are used as hole transport layer and electron transport layer, respectively; 50 nmthick polymers layer is used as EML, and 1 nm-thick LiF layer used as electron injection layer. 1,[31][32][33][34][35] Fig . 6a-d shows the EL spectra for all polymers-based PLEDs at voltages varying from 7 to 11 V. It can be seen that all resulting PLEDs with PFCzSDF10Ir6, PFCzSDF10Ir7, PFCzSDF10Ir8, PFCzSDF10Ir9 as realize good white emission with CIE coordinate of at (0.27,0.25), (0.27,0.24), (0.26,0.30), and (0.27,0.31) at 11 V, respectively, and the EL spectra for these PLEDs all contain two main emission peaks located at blue and orange-red wavebands, which are corresponding to the emissions of poly(uorene-altcarbazole) branches and red dimming phosphor group (Ir(piq) 2acac).…”

Rational design of quinoxaline-based bipolar host materials for highly efficient red phosphorescent organic light-emitting diodes

“…In two red devices, different function materials were chosen on the basis of knowing the energy level of materials, and the thickness of different layers was decided by combining the reported relevant literature and mobility of materials. 4,6,25 In these devices, ITO was used as an anode; the LiF/Al layers were employed as a composite cathode; 40 nm-thick PEDOT:PSS layer was used as the hole-injection layer; 45 nm-thick TAPC layer was used as the hole transporting layer; 5 nm-thick TCTA layer was used as the exciton blocking layer and 55 nm-thick TmPyPB layer as the electron transport layer. From the energy level diagram of two red devices in Fig.…”

“…In recent years, owing to their fascinating commercial potential in the elds of exible displays and solid state lighting, organic light-emitting diodes (OLEDs) have attracted great attention. [1][2][3][4][5][6][7] Organic electroluminescent materials have been developed and have been extensively studied. [8][9][10][11][12][13][14][15][16][17] Later Forrest and co-authors found that transition-metal complexes are a new class of highly efficient phosphorescent materials.…”

Conductive polyurethane elastomer electrolyte (PUEE) materials for anodic bonding

“…[1][2][3][4][5][6][7] Generally, the structure of a exible device includes a exible substrate, exible electrodes, functional materials and the sealing layer. [8][9][10][11][12] To achieve highperformance exible devices, except for the new organic electronic materials, advanced preparation and packaging techniques need to be comprehensively explored. Investigations have shown that packaging quality, one of the key indices of device preparation, directly determines the photoelectric performance, stability and lifetime of the product.…”