Electromodulation of photoluminescence in vacuum-evaporated films of bathocuproine

Miśnik, Maciej; Falkowski, Karol; Mróz, Wojciech; Stampor, Waldemar

doi:10.1016/j.chemphys.2012.10.013

Cited by 8 publications

(3 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In comparison to the photoluminescence of the Cu(I) complexes in doped films (20 wt % in CBP:TcTa (7:3)) at ambient temperature, the electroluminescence was slightly shifted, while the curve progression was very similar (SI Figures S186–S190). The observed shift is very small and can be explained by the generalized Stark effect − or partial reabsorption by the neighboring organic layers within the OLED heterostructure, absent when the photoluminescence was investigated. , The electroluminescence originates from the Cu(I) complexes and not from the matrix, while for the photoluminescence, a slight contribution from the matrix is visible. In general, the emission of the doped films and the corresponding OLEDs are comparable.…”

Section: Results and Discussionmentioning

confidence: 96%

Various Structural Design Modifications: para-Substituted Diphenylphosphinopyridine Bridged Cu(I) Complexes in Organic Light-Emitting Diodes

et al. 2021

View full text Add to dashboard Cite

show abstract

Section: Results and Discussionmentioning

confidence: 96%

Various Structural Design Modifications: para-Substituted Diphenylphosphinopyridine Bridged Cu(I) Complexes in Organic Light-Emitting Diodes

et al. 2021

View full text Add to dashboard Cite

show abstract

“…This peak energy (∼3.0 eV) hardly corresponds to the offset between the LUMO of BCP (∼3.0 eV) and the HOMO of SAFDPA (∼5.6 eV). The PL spectra of BCP (Figure b) show secondary peaks at 520 nm owing to the effect of excimers, dimers, or other aggregates which destroy by doping SAFDPA. The PL spectra of mixture films of SAFDPA:TmPyPB of 1:1 (w:w) do not show the red shift relative to the PL spectrum of SAFDPA, as exhibited in Figure c.…”

Section: Resultsmentioning

confidence: 99%

Highly Simplified Reddish Orange Phosphorescent Organic Light-Emitting Diodes Incorporating a Novel Carrier- and Exciton-Confining Spiro-Exciplex-Forming Host for Reduced Efficiency Roll-off

Zhang

Wang

et al. 2017

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

A novel exciplex-forming host is applied so as to design highly simplified reddish orange light-emitting diodes (OLEDs) with low driving voltage, high efficiency, and an extraordinarily low efficiency roll-off, by combining N,N-10-triphenyl-10H-spiro [acridine-9,9'-fluoren]-3'-amine (SAFDPA) with 4,7-diphenyl-1,10-phenanthroline (Bphen) doped with trivalent iridium complex bis(2-methyldibenzo[f,h]quinoxaline) (acetylacetonate)iridium(III) (Ir(MDQ)(acac)). The reddish orange OLEDs achieve a strikingly high power efficiency (PE) of 31.80 lm/W with an ultralow threshold voltage of 2.24 V which is almost equal to the triplet energy level of the phosphorescent reddish orange emitting dopant. The power efficiency of the device with the exciplex-forming host is enhanced, achieving 36.2% mainly owing to the lower operating voltage by the novel exciplex forming cohost, compared with the reference device (23.54 lm/W). Moreover, the OLEDs show extraordinarily low current efficiency (CE) roll-off to 1.41% at the brightness from 500 to 5000 cd/m with a maximal CE of 32.87 cd/A (EQE = 11.01%). The devices display a good reddish orange color (CIE of (0.628, 0.372) at 500 cd/m) nearly without color shift with increasing brightness. Co-host architecture phosphorescent OLEDs show a simpler device structure, lower working voltage, and a better efficiency and stability than those of the reference devices without the cohost architecture, which helps to simplify the OLED structure, lower the cost, and popularize OLED technology.

show abstract

“…Although 1,10-phenanthroline has a very small fluorescence quantum yield (Φ F = 0.0087 in DCM) and a short lifetime (t < 1 ns) (11), derivatives of 1,10-phenanthroline have drawn interest due to their emissive properties. From low molecular weight, well defined, structures to polymers and metal complexes, compounds using 1,10-phenanthroline as a building block have been used as fluorescent sensors (12)(13)(14)(15), photocatalysts (16)(17)(18)(19)(20), imaging agents (21)(22)(23), and OLEDs (24)(25)(26) among other optoelectronic applications (27)(28)(29)(30).…”

Section: Introductionmentioning

confidence: 99%

Photophysical Properties of Fluorescent 2‐(Phenylamino)‐1,10‐phenanthroline Derivatives^†

Teixeira

Silva

Gaspar

et al. 2020

Photochem & Photobiology

View full text Add to dashboard Cite

The present study details the experimental and theoretical characterization of the photophysical properties of 14 examples of 2‐(phenylamino)‐1,10‐phenanthrolines (1). The absorption spectra of 1 are substituent‐dependent but in a general manner present absorption bands at wavelengths of ~230; ~300; ~335 and a shoulder at ~380 nm. Electron‐donating groups (EDG) and electron‐withdrawing groups (EWG), respectively, result in bathochromic and hypsochromic shifts. Compounds 1 are highly luminescent, in contrast to phenanthroline, and emit in the region between 350 and 500 nm with substituent‐dependent λmax emission. The emission spectra show a redshift for EDG (4‐OMe 62 nm; 4‐Me 19 nm) and a blueshift for EWG (4‐CN 41 nm; 4‐CF3 38 nm) relative to the emission of the unsubstituted parent compound 1a. Plotting the λmaxEM against Hammett σ+ constants gave an excellent linear correlation demonstrating the electron‐deficient nature of the excited state and how the substituents (de)stabilize S1. Theoretical calculations revealed a HOMO‐LUMO π‐π* electronic transition to S1 which in combination with difference (S1–S0) in electron density maps revealed charge‐transfer character. Strongly electron‐withdrawing substituents switch off the charge transfer to give rise to a local excitation.

show abstract

Electromodulation of photoluminescence in vacuum-evaporated films of bathocuproine

Cited by 8 publications

References 47 publications

Various Structural Design Modifications: para-Substituted Diphenylphosphinopyridine Bridged Cu(I) Complexes in Organic Light-Emitting Diodes

Various Structural Design Modifications: para-Substituted Diphenylphosphinopyridine Bridged Cu(I) Complexes in Organic Light-Emitting Diodes

Highly Simplified Reddish Orange Phosphorescent Organic Light-Emitting Diodes Incorporating a Novel Carrier- and Exciton-Confining Spiro-Exciplex-Forming Host for Reduced Efficiency Roll-off

Photophysical Properties of Fluorescent 2‐(Phenylamino)‐1,10‐phenanthroline Derivatives^†

Contact Info

Product

Resources

About

Electromodulation of photoluminescence in vacuum-evaporated films of bathocuproine

Cited by 8 publications

References 47 publications

Various Structural Design Modifications: para-Substituted Diphenylphosphinopyridine Bridged Cu(I) Complexes in Organic Light-Emitting Diodes

Various Structural Design Modifications: para-Substituted Diphenylphosphinopyridine Bridged Cu(I) Complexes in Organic Light-Emitting Diodes

Highly Simplified Reddish Orange Phosphorescent Organic Light-Emitting Diodes Incorporating a Novel Carrier- and Exciton-Confining Spiro-Exciplex-Forming Host for Reduced Efficiency Roll-off

Photophysical Properties of Fluorescent 2‐(Phenylamino)‐1,10‐phenanthroline Derivatives†

Contact Info

Product

Resources

About

Photophysical Properties of Fluorescent 2‐(Phenylamino)‐1,10‐phenanthroline Derivatives^†