A new ambipolar blue emitter for NTSC standard blue organic light-emitting device

Tsai, Tsung-Cheng; Hung, Wen‐Yi; Chi, Liang‐Chen; Wong, Ken‐Tsung; Hsieh, Cheng‐Chih; Chou, Pi‐Tai

doi:10.1016/j.orgel.2008.10.017

Cited by 63 publications

(13 citation statements)

References 23 publications

(28 reference statements)

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“…Encouragingly, PtON7-based device demonstrated a blue color with a CIE coordinates of (0.15, 0.14) and peak EQE of 23.7% still remained 20.4% at 100 cd/m 2 [26]. However, due to the broad device emission spectrum (FWHM = 54 nm) and significant green emission contamination, the CIE coordinates of (0.15, 0.14) still fail to reach the standard of the "pure" blue coordinates of (0.14, 0.08) [38].…”

Section: N-heterocyclic Carbene-based Tetradentate Platinum(ii) Complmentioning

confidence: 96%

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Tetradentate Cyclometalated Platinum(II) Complexes for Efficient and Stable Organic Light-Emitting Diodes

Li¹,

She²

2018

Light-Emitting Diode - An Outlook on the Empirical Features and Its Recent Technological Advancements

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As one of the most important phosphorescent emitters, tetradentate cyclometalated platinum(II) complexes have attracted much attention in recent years, because of the high luminescent efficiency, emission spectra, and color tuned easily, especially for the development of high-efficient deep-blue and "pure" blue emitters and single-doped white organic light-emitting diodes (OLEDs). Also, some platinum(II)-based OLEDs exhibited superior operational stability, indicating their potentials in full-color display and solidstate lighting applications. In this chapter, we will introduce the recent advances of the tetradentate cyclometalated platinum(II) complexes, including pyrazole, N-heterocyclic carbene, imidazole and pyridine-based complexes, molecular design, photophysical properties, and some of their device performances.From the spin statistics, it is well known that the singlet and triplet in the electrogenerated excitons are 25 and 75%, respectively [3]. As a result, OLEDs using fluorescent emitters, which emit from the singlet excited state, can achieve a peak internal quantum efficiency (IQE) only 25%. However, if heavy metal ion is incorporated into the organic ligand, phosphorescent emitters can break the spin-forbidden reactions, and fast intersystem crossing (IC) from singlet to triplet state can occur owing to the strong electron spin-orbit coupling (SOC); thus, heavy metal complexes have the potential to harvest both the electrogenerated singlet and triplet excitons and achieve 100% IQE. In 1998, Forrest and Thompson et al. and Che et al. first reported the electrogenerated phosphorescent platinum(II) [4] and osmium(II) [5] complexes, respectively. Afterward, more heavy metal complexes were found to be used as efficient phosphorescent materials, like iridium(III), ruthenium(II), palladium (II), rhodium (III), gold(III), and so on, and some reviews about these complexes have been published [6][7][8][9][10][11][12][13][14][15][16][17][18]. Among them, iridium(III) complexes have been most widely studied. Green and red phosphorescent iridium(III) emitters developed by Universal Display Corporation (UDC) have been successfully commercialized due to their superior efficiency and long operational lifetime. OLED display doped these emitters that have been adopted for several types of high-end personal electronics, such as Samsung Galaxy, LG OLED television, Apple smart watch, and iPhone X. Compared with the liquid crystal display (LCD), OLED display have many outstanding merits, such as low-cost fabrication methods, high color quality, and high-luminance efficiency and also many advantages of low power consumption, wide-viewing angle, wide temperature range, fast response, etc [19,20]. Thus, OLED has been widely considered as the next generation of full-color display and solidstate lighting technologies.The development of high efficient and stable phosphorescent emitters is of the most importance for the development of OLEDs and their application. Although thousands of phosphorescent heavy metal complexes have ...

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Section: N-heterocyclic Carbene-based Tetradentate Platinum(ii) Complmentioning

confidence: 96%

“…Interestingly, although adopting different ancillary ligands, PtOO2 (38) and PtON2 (39) nearly have the same T 1 state level, corresponding to their dominant peaks at 462 and 460 nm Table 6. Photophysical properties of imidazole-based tetradentate platinum(II) complexes.…”

Section: Imidazole-based Tetradentate Platinum(ii) Complexesmentioning

confidence: 99%

Tetradentate Cyclometalated Platinum(II) Complexes for Efficient and Stable Organic Light-Emitting Diodes

Li¹,

She²

2018

Light-Emitting Diode - An Outlook on the Empirical Features and Its Recent Technological Advancements

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“…With all these properties, PEDOT:PSS is now widely used in optoelectronic devices. For example, it can be used as a hole transporter layer in organic light-emitting diodes (OLED) [3][4][5], or as a buffer layer between the ITO and active layers in organic solar cells (OSC) [6][7][8]. However, the film also suffers low conductivity with about 0.05 ∼ 0.8 S/cm [9,10], which directly affects the performance of the device [11,12].…”

Section: Introductionmentioning

confidence: 99%

Influence of MWCNTs Doping on the Structure and Properties of PEDOT:PSS Films

Liu

Gao

et al. 2009

International Journal of Photoenergy

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Poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) doped with multi-walled carbon nanotubes (MWCNTs) films is fabricated on quartz substrates by spin coating method. The effects of MWCNTs on the structure and properties of PEDOT:PSS film have been investigated. X-ray diffractometer (XRD) and Fourier transform Raman spectroscopy (FTRM) show that the crystallization behavior and the main chain of PEDOT:PSS are not changed. Atomic force microscopy (AFM) shows that individual nanotubes are well dispersed in the PEDOT:PSS matrix. Moreover, some nanotubes overlap into a net-like structure, forming new conductive channels, which can enhance efficiently the film conductivity. The conductivity of PEDOT:PSS film doped with a lower percentage of MWCNTs (0.2 wt%) is 9.16 S/cm, higher than that of pure PEDOT:PSS film (0.28 S/cm), although the optical transmission of PEDOT:PSS decreases a little after the addition of MWCNTs. The interaction between MWCNTs and PEDOT:PSS during melt mixing is also given a possible explanation.

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“…For coplanar conjugated backbone approach, a blue emitting material In2Bt (Scheme 2) was designed and synthesized. [44] The spectroscopic characteristics of In2Bt in solution and in solid state were found to be similar. The materials exhibited excellent thermal, morphological and electrochemical stabilities as indicated by the relevant experimentally observed data.…”

Section: Fluorescent Blue Materials: Fluorene Derivatives With Introdmentioning

confidence: 83%

Development of Materials for Blue Organic Light Emitting Devices

Sarma

Wong

2019

The Chemical Record

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The success of organic light emitting diodes (OLED) has been witnessed by the commercialization of this technology for manufacturing the vivid and colorful displays used in our daily life now. The prospective growth of OLED technology on display industry will be optimistic. Over the last three decades, many different approaches on material and device designs have been implemented for improving the efficiency and stability of OLED devices. These efforts install main cornerstones to support the great achievement of OLED technology. However, until now, the performance and stability of blue OLEDs still have some concerns. This troublesome issue should be totally conquered before the large-scale manufactures dominated over other display technologies, particularly liquid crystal-based displays, takes place. Though significant progress has already been made to achieve high performance and long lifetime blue OLEDs, this topic still remains as one of the hot researches in OLEDs. We have been working on this area for about two decades and made some notable contributions. Consequently, in this personal account we have outlined our efforts to obtain better performing blue OLEDs by utilizing a range of emitters based on fluorescence, phosphorescence, delayed fluorescence and exciplex systems. We have also developed some novel host materials for blue OLEDs, which are worth mentioning in this account.Keywords: blue fluorescent emitter, phosphorescent complex, delayed fluorescence, exciplex, bipolar host materials [a] M.

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A new ambipolar blue emitter for NTSC standard blue organic light-emitting device

Cited by 63 publications

References 23 publications

Tetradentate Cyclometalated Platinum(II) Complexes for Efficient and Stable Organic Light-Emitting Diodes

Tetradentate Cyclometalated Platinum(II) Complexes for Efficient and Stable Organic Light-Emitting Diodes

Influence of MWCNTs Doping on the Structure and Properties of PEDOT:PSS Films

Development of Materials for Blue Organic Light Emitting Devices

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