Green emitter

It should be pointed out that the structure C5 (yellow-green emitter) is identical to the structure Cl that was previously assigned to the red light emitter. 

Green emitter 366 [435] The device with the structure ITO/BTPD-PFCB/366/Ca/Ag works at the operating voltage of 3.6 V and reaches extremely high <1>el = 6% (18.5-28.6 cd/A) and a maximum brightness of 59,400 cd/m2. These unusually high values are unique and await to be reproduced and surpassed by researchers in the field. 

SCHEME 3.1 Chemical structures of anthracene, a hole transport triarylamine, an electron transport and a green emitter Alq3, and a phosphorescent dopant PtOEP. 

The phenomenon of organic EL was first demonstrated using a small-molecule fluorescent emitter in a vapor-deposited OLED device. The Kodak group first used metal oxinoid materials such as the octahedral complex aluminum tris-8-hydroxyquinoline (Alq3) (discussed above as an ETM) as the fluorescent green emitter in their pioneering work on OLED architectures [167],... 

The sixth class of green emitters is metal organic complexes. Alq3 was the first green emitter. Alq3 emission exhibits relatively saturated green color (CIE 1931 coordinates (0.32,0.55)) and so far, it is still one of the best green emitters available. 

Other metal complexes such as those of Boron shown in Scheme 3.47 (148) have also been reported to be viable green emitters. 

Fig. 3b). The conversion of red emitters into green emitters with time was explained as an oxidation reaction confirmed by the addition of extra reductant, which leads to the transformation of green emitters into red ones [48]. 

Fig. 4 Steady-state excitation and emission spectra for live distinct ssDNA encapsulated Ag clusters, (a) Blue emitters created in 5 -CCCTTTAACCCC-3, (b) green emitters created in 5 -CCCTCTTAACCC-3, (c) yellow emitters created in 5 -CCCTTAATCCCC-3, (d) red emitters created in 5 -CCTCCTTCCTCC-3, and (e) near-IR emitters created in 5 -CCCTAACTCCCC-3. (f) Pictures of emissive solutions in (a)-(d) [46]...

Heat is necessary to volatilize and excite the emitter, but you must not exceed the dissociation temperature of molecular species (or the ionization temperature of atomic species) or color quality wiU suffer. For example, the green emitter BaCl is unstable above 2000°C and the best blue emitter, CuCl, should not be heated above 1200°C [5]. 

New use of rare earth phosphors in color TV would most likely result from choice of Tb or Eu2+ based green emitters. 

The fluorescence which arises from f->-f transitions within the Ln3+ ion is employed in color television sets, the screens of which contain three phosphor emitters. The red emitter is Eu3+ in Y2O2S orEu3+ Y203. The main emissions for Eu3+ are between the SD0 -> 1Fn (n = 4 to 0) levels. The green emitter is Tb3+ in Tb3+ La202S. The main emissions for Tb3+ are between the 5 >4 and 1Fn (n = 6 to 0) levels. The best blue emitter is Ag, Al ZnS, which has no Ln3+ component. 

In Luc environment, we obtained two representative structures, models A-a and A-b. These two gave the emission energies of 2.33 and 2.08 eV, respectively, as shown in Calc. Ill in Table 4-5. Since these values were close to the experiment (2.23 eV) [128, 129], keto-OxyLH2 in the anionic form (keto-s-trans(-l) in Figure 4-12 (a)) was confirmed to be the yellow-green emitter in Luc environment. The character of the excited state is one-electron transition from HOMO(tt) to LUMO(tt ), and these orbitals are clearly localized within OxyLH2. 

The Sonogashira cross-coupling reaction was applied to p-phenylethynes and 2-chloroquinoline. The resulting compounds are blue-green emitters. Their electrogenerated chemiluminescence properties were reported <03CC2146>. 

Dipicolinic acid or 2,6-pyridinedicarboxylic acid (H2dipic), an excellent chromophore for Eu(III) and Tb(III) sensitization, forms stable tris complexes with RE(III) ions, [RE(dipic)3] [78], The Eu(III) and Tb(III) complexes are very bright red and green emitters with quantum yields of 12 and 21%, respectively. All of their RE(III) analogs are isostructural and their second order NLO activities were reported. In the complexes, the RE(III) ions are coordinated by three tridentate dipic with a symmetry close to D3, CN = 9 [79],... 

A novel bis-/3-diketone 2,6-bis(3-phenyl-3-ketopropionyl)pyridine with Eu, Tb, Sm and Gd ions is luminescent. All these rare-earth ions could be sensitized to some extent by the ligand. In particular, the Tb + complex is an excellent green emitter and may find application in organic light-emitting devices (OLEDs) and medical diagnosis" . 

Unfortunately, as with PDAFs, obtaining stable blue emission in the solid state has presented difficulties. The tetraoctylpolymer 87 was a green emitter in the solid state, with the PL and EL spectrum being dominated by a broad emission band at 560 nm [113]. Films of the polymer 88 with ethylhexyl substituents show blue PL (A.max = 429 450 nm). The EL from 88 was initially... 

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