Near-infrared organic light-emitting diodes with very high external quantum efficiency and radiance

Ly, Kiet Tuong; Chen-Cheng, Ren-Wu; Lin, Huey-Wen; Shiau, Yu-Jeng; Liu, Shih-Hung; Chou, Pi‐Tai; Tsao, Chia Wen; Huang, Yu‐Ching; Chi, Yun

doi:10.1038/nphoton.2016.230

Cited by 553 publications

(230 citation statements)

References 41 publications

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“…The beneficial effect of the emitting dipole orientation on the light outcoupling efficiency was further illustrated in a following work by the group of Chi [14]. Exploiting the strong tendency to form ordered structures, a new series of platinum(II) bearing fluorinated 2-pyrazinylpyrazoles was developed, namely complexes 16 – 18 in Fig.…”

Section: Reviewmentioning

confidence: 99%

“…Chemical structure of neutral platinum(II) complexes 16 – 18 bearing azine-pyrazolato bidentate ligands [14]. …”

Section: Reviewmentioning

confidence: 99%

“…In spite of that, highly performing vacuum-processed devices with record EQEs up to 54% have been reported to date for PhOLEDs based on Ir(III) with optimized light outcoupling [12]. On the other hand, an impressive EQE value as high as 38.8% [13] and 55% [14] have been recently achieved in platinum(II)-based OLEDs without and with outcoupling elements, respectively, via engineering of transition dipole moment orientation in the device active matrix.…”

Section: Introductionmentioning

confidence: 99%

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Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

Cebrián

Mauro

2018

Beilstein J. Org. Chem.

150

114

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Phosphorescent organometallic compounds based on heavy transition metal complexes (TMCs) are an appealing research topic of enormous current interest. Amongst all different fields in which they found valuable application, development of emitting materials based on TMCs have become crucial for electroluminescent devices such as phosphorescent organic light-emitting diodes (PhOLEDs) and light-emitting electrochemical cells (LEECs). This interest is driven by the fact that luminescent TMCs with long-lived excited state lifetimes are able to efficiently harvest both singlet and triplet electro-generated excitons, thus opening the possibility to achieve theoretically 100% internal quantum efficiency in such devices. In the recent past, various classes of compounds have been reported, possessing a beautiful structural variety that allowed to nicely obtain efficient photo- and electroluminescence with high colour purity in the red, green and blue (RGB) portions of the visible spectrum. In addition, achievement of efficient emission beyond such range towards ultraviolet (UV) and near infrared (NIR) regions was also challenged. By employing TMCs as triplet emitters in OLEDs, remarkably high device performances were demonstrated, with square planar platinum(II) complexes bearing π-conjugated chromophoric ligands playing a key role in such respect. In this contribution, the most recent and promising trends in the field of phosphorescent platinum complexes will be reviewed and discussed. In particular, the importance of proper molecular design that underpins the successful achievement of improved photophysical features and enhanced device performances will be highlighted. Special emphasis will be devoted to those recent systems that have been employed as triplet emitters in efficient PhOLEDs.

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Section: Reviewmentioning

confidence: 99%

“…Chemical structure of neutral platinum(II) complexes 16 – 18 bearing azine-pyrazolato bidentate ligands [14]. …”

Section: Reviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

Cebrián

Mauro

2018

Beilstein J. Org. Chem.

150

114

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“…Therefore, electrical resistance is proportional to the sample's length and the resistivity and inversely proportional to the samples cross sectional area (4): The electrical resistivity of In(OH)xSy films as measured by using the four point probe interfaced with the Keithley 2400 source meter is tabulated in Table 2. As shown in Table 2 there was a slight decrease in electrical resistivity of the In(OH)xSy thin films with increase in annealing temperature up to 240 °C when a significant increase in resistivity is realized appropriate for light emitting diodes [12], and photo detectors applications [25,9]. The initial increase can be attributed to improved re-crystallization [10] of the crystal lattice of the In(OH)xSy films before the increase of boundary scattering centers that may be was due to film decomposition that could have created vacancies resulting from evaporation of sulphur or elimination of hydroxyl group on further annealing.…”

Section: Figure 4 -Illustration Of Band Gap Of In(oh) X S Y With Densmentioning

confidence: 94%

Impact of Annealing Thin Films In(OH)xSy Growth By Solution Technique

Mosiori

Magare

Munji

2017

PoS

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Abstract. Indium Hydroxy Sulphide has demonstrated abundance in resources, low prices, nontoxic characteristics, radiation resistance, high temperature resistance, and chemical stability, and therefore it has become an extremely important photoelectric, photovoltaic, and light sensing thin film material. Some treatment on this material include thermal annealing which is a process used for intrinsic stress liberation, structural improving, and surface roughness to control its electro-optical properties. In a qualitative way, annealing modifies surface morphology, intrinsic parameters, and electron mobility with temperature and time. In this work, an explanation on the surface modification of In(OH) x S y thin films when subjected to an annealing process is discussed. Both electrical and optical effects caused by annealing were carried out and characterizations were performed at different annealing temperatures in nitrogen in the temperature range 373-573 K. Using optical measurements data and simulated data, Scout software was employed and the results showed that increasing annealing temperature causes a slight decrease in transmittance with a consequence of modifying the energy band gaps values between 2.79-3.32 eV. It was concluded that annealing influence optical transmittance and resistance of the film make the thin films potential for photovoltaic, and light sensing applications.

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“…Luminescent polymers have been considered the most promising class of materials in developing new technologies for light-emitting devices since the discovery of Poly (p-phenylenevinylene) (PPV) and its remarkable electroluminescence properties 1–3 . Indeed, PPV (or PPV-like) systems have been successfully employed as active components in developing polymer light-emitting diodes (PLEDs) with high quantum yield of luminescence 4,5 and low environmental impact.…”

Section: Introductionmentioning

confidence: 99%

Charge Carrier Scattering in Polymers: A New Neutral Coupled Soliton Channel

Ribeiro

Monteiro

Cunha

et al. 2018

Sci Rep

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The dynamical scattering of two oppositely charged bipolarons in non-degenerate organic semiconducting lattices is numerically investigated in the framework of a one-dimensional tight-biding–Hubbard model that includes lattice relaxation. Our findings show that it is possible for the bipolaron pair to merge into a state composed of a confined soliton-antisoliton pair, which is characterized by the appearance of states within less than 0.1 eV from the Fermi level. This compound is in a narrow analogy to a meson confining a quark-antiquark pair. Interestingly, solitons are quasi-particles theoretically predicted to arise only in polymer lattices with degenerate ground state: in the general case of non-degenerate ground state polymers, isolated solitons are not allowed.

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Near-infrared organic light-emitting diodes with very high external quantum efficiency and radiance

Cited by 553 publications

References 41 publications

Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

Impact of Annealing Thin Films In(OH)xSy Growth By Solution Technique

Charge Carrier Scattering in Polymers: A New Neutral Coupled Soliton Channel

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