The development of phenylethylene dendrons for blue phosphorescent emitters

Lo, Shih‐Chun; Harding, Ruth E.; Brightman, Edward; Burn, Paul L.; Samuel, Ifor D. W.

doi:10.1039/b820235d

Cited by 40 publications

(34 citation statements)

References 39 publications

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“…This suggests Ir-complex 2 as a promising candidate for application in non-doped solution-processed OLEDs. [24][25][26]31,32,43,44 The reduced intermolecular interactions of Ir-complex 2 are also in accordance with its longer intermolecular IrÁ Á ÁIr distance (B12.90 Å) than those in fac-(dfpypy) 3 Ir (B9.10 Å) 42 and fac-(pmb) 3 Ir (B9.38 Å). 34 The dendrimers D1 and D2 were characterized by 1 H and 13 C NMR, MALDI-TOF mass and high-resolution mass spectroscopy.…”

Section: Synthesis and Characterizationsupporting

confidence: 62%

Bulky, dendronized iridium complexes and their photoluminescence

et al. 2019

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Section: Synthesis and Characterizationsupporting

confidence: 62%

Bulky, dendronized iridium complexes and their photoluminescence

et al. 2019

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“…Given that the melting point (mp) of Cibalackrot A (≈306–309 °C) was higher than the upper limit of the DSC used, these endothermic processes indicate multiple crystal‐crystal transitions/rearrangements upon heating . Interestingly, there were no thermal transitions found for Cibalackrot B, likely due to the more amorphous in nature of the material caused by attachment of the branched solubilizing groups …”

Section: Resultsmentioning

confidence: 99%

Deep‐Red Lasing and Amplified Spontaneous Emission from Nature Inspired Bay‐Annulated Indigo Derivatives

Shukla

Wallwork

et al. 2019

Advanced Optical Materials

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While noteworthy progress has been made on organic solid‐state lasers with low amplified spontaneous emission (ASE) thresholds and high optical gains in blue and green colors, the same advancement has not been achieved for red laser dyes. This is mainly due to their low photoluminescence quantum yields (PLQYs) because of “energy bandgap law.” Here, a new family of solution‐processable organic semiconductor laser dyes based on a bay‐annulated indigo derivative (Cibalackrot) with deep‐red emission is reported. They exhibit excellent PLQYs and low ASE thresholds (9.6 µJ cm−2) with deep‐red emission when blended in a mixed host of 1,3‐bis(N‐carbazolyl)benzene (mCP) and 2‐hydroxyphenylbenzothiazole (HBT). In contrast to a single blend in mCP, the co‐blend films are found to significantly enhance the photostability by retaining 90% of initial ASE intensity even after continuous pumping with over 9000 pulses at a pump input energy twice that of the ASE threshold, which can be attributed to efficient cascade energy transfer from mCP to HBT and then to the Cibalackrot chromophore. Low lasing threshold of 6 µJ cm−2 is further achieved at 641 nm by using distributed feedback gratings. Transient absorption spectroscopy measurements indicate that the dye has extremely low yield of triplet excited‐state under optical excitation. The results show Cibalackrot derivatives to be a promising new family of organic deep‐red laser dyes.

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“…25 We show that several different emission colours, including near white, can be reversibly generated by changing the applied potential. We also investigate the annihilation ECL mechanism using the 3D-ECL technique to obtain information not readily obtainable by traditional methods.…”

Section: Introductionmentioning

confidence: 82%