An efficient dual-emissive-layer white organic light emitting-diode: Insight into device working mechanism and origin of color-shift

Wang, Qi; Ma, Dongge; Ding, Junqiao; Wang, Lixiang; Qiao, Qiquan; Jia, Haiying; Gnade, Bruce E.; Hoshikawa-Halbert, Jason

doi:10.1016/j.orgel.2015.01.027

Cited by 10 publications

(3 citation statements)

References 55 publications

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“…Generally, due to the alteration of carrier recombination zone, multi-doped single-host WOLEDs without interlayer show unavoidable spectral variation at different driving voltages. 19 This was further conrmed in our work. Fig.…”

Section: Resultssupporting

confidence: 71%

“…17 However, the more stable spectra, which is a crucial parameter for the commercial applications of WOLEDs, still need to be further improved in single-host WOLEDs. [18][19][20] For instance, Han et al 18 reported a single phosphine oxide host for highefficiency complementary WOLED with extremely low operating voltage and reduced efficiency roll-off, but this white device showed large Commission Internationale de L'Eclairage (CIE) coordinates' variation with (0.45, 0.45) at 1482 cd m À2 shi to (0.42, 0.44) at about 10 000 cd m À2 . Wang et al 19 reported an efficient dual-emissive-layer WOLED with blue and yellow phosphors doped in a single host, the resulting white device showed a poor color stability with CIE coordinates' variation above (AE0.09, AE0.04) from 4 V to 8 V. In short, the voltage-dependent color shis exceeding a tolerable margin are generally observed in these devices with multi-emission layers structure in single host.…”

Section: Introductionmentioning

confidence: 99%

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Improved color stability of complementary WOLED with symmetrical doped phosphors in single host: experimental verification and mechanism analysis

et al. 2017

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Section: Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Improved color stability of complementary WOLED with symmetrical doped phosphors in single host: experimental verification and mechanism analysis

et al. 2017

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“…Meanwhile, high EL efficiencies and low efficiency roll-off were obtained (see below), which is probably due to the steric effects induced by the methoxy group. The single-host strategy is employed to avoid unnecessary energy barriers, which is beneficial for carrier injection and transport among different emissive layers …”

Section: Resultsmentioning

confidence: 99%

Molecular Engineering of Phenylbenzimidazole-Based Orange Ir(III) Phosphors toward High-Performance White OLEDs

et al. 2018

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To develop B-O complementary-color white organic light-emitting diodes (WOLEDs) exhibiting high efficiency and low roll-off as well as color stability simultaneously, we have designed two orange iridium(III) complexes by simply controlling the position of the methoxyl group on the cyclometalated ligand. The obtained emitters mOMe-Ir-BQ and pOMe-Ir-BQ show good photophysical and electrochemical stabilities with a broadened full width at half-maximum close to 100 nm. The corresponding devices realize highly efficient electrophosphorescence with a maximum current efficiency (CE) and power efficiency (PE) of 24.4 cd A and 15.3 lm W at a high doping concentration of 15 wt %. Furthermore, the complementary-color all-phosphor WOLEDs based on these phosphors exhibit good performance with a maximum CE of 31.8 cd A, PE of 25.0 lm W, and external quantum efficiency of 15.5%. Particularly, the efficiency of this device is still as high as 29.3 cd A and 14.2% at the practical brightness level of 1000 cd m, giving a small roll-off. Meanwhile, extremely high color stability is achieved by these devices with insignificant chromaticity variation.

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Investigation on Optical and Biological Properties of 2‐(4‐Dimethylaminophenyl)benzothiazole Based Cycloplatinated Complexes

Lara

Millán

Moreno

et al. 2021

Chemistry A European J

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The optical and biological properties of 2-(4-dimethylaminophenyl)benzothiazole cycloplatinated complexes fea-Complexes 1-6 display 1 ILCT and metal-perturbed 3 ILCT dual emissions. The ratio between both bands is excitation dependent, accomplishing warmwhite emissions for 2, 5 and 6. The phosphorescent emission is lost in aerated solutions owing to photoinduced electron transfer to 3 O 2 and the formation of 1 O 2 , as confirmed in complexes 2 and 4. They also exhibit photoinduced phosphorescence enhancement in non-degassed DMSO due to local oxidation of DMSO by sensitized 1 O 2 , which causes a local degassing. Me 2 N-pbtH and the complexes specifically accumulate in the Golgi apparatus, although only 2, 3 and 6 were active against A549 and HeLa cancer cell lines, 6 being highly selective in respect to nontumoral cells. The potential photodynamic property of these complexes was demonstrated with complex 4.

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An efficient dual-emissive-layer white organic light emitting-diode: Insight into device working mechanism and origin of color-shift

Cited by 10 publications

References 55 publications

Improved color stability of complementary WOLED with symmetrical doped phosphors in single host: experimental verification and mechanism analysis

Improved color stability of complementary WOLED with symmetrical doped phosphors in single host: experimental verification and mechanism analysis

Molecular Engineering of Phenylbenzimidazole-Based Orange Ir(III) Phosphors toward High-Performance White OLEDs

Investigation on Optical and Biological Properties of 2‐(4‐Dimethylaminophenyl)benzothiazole Based Cycloplatinated Complexes

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