Organic Light‐Emitting Diode Application of Fluorescent Cellulose as a Natural Polymer

Abstract

Fluorescent cellulose derivatives were synthesized by utilizing the carbazole group in order to induce optical and semi‐conducting properties. The PL spectra of these cellulose derivatives exhibit UV‐blue emissions at about 350–450 nm attributed to carbazole groups. Analyses of photoelectron spectra were also performed to determine IP values. The results of IP, UV‐vis and PL analyses were almost the same as those of PVK, while the PL intensity and efficiency of the cellulose derivatives were quite different. These compounds functioned as hole transporting materials of OLEDs. Devices using each of the derivatives showed different electronic behavior (current density‐voltage characteristics, EL spectra, etc.), indicating the importance of regioselectivity of the substituent group.

Structure and Properties of Microcrystalline Cellulose "Ceramics-Like" Composites Incorporated with LaVO4:Sm Oxide Compound

“…Besides, mentioned characteristics are similar to those published elsewhere concerning luminescence of various cellulosebased materials [5,[8][9][10].…”

“…Observed consistent changes of the (ε , ε ) values in these ranges with step-by-step changes of probing frequency (5,10,20, and then 50 kHz) can be caused by consecutive temperature treatment of the sample. Namely, each heating from -180 up to 130…”

“…At the same time, they are of interest as materials for applications in electronic and opto-electronic devices, e.g. such as solar cells, supercapacitors, lithium-ion batteries, flexible "paper" electronics [5][6][7] and luminescent materials [8][9][10] particularly for their potential applications as chemical and biological sensors or for toxic chemical removing [11][12][13].…”

Renewable polymeric materials for electronic applications

“…Furthermore, the cellulose materials that were integrated into an organic light-emitting diode showed a high current density and a low turn-on voltage of 6.5 V for 0.1 cd m − 2 light emission. 66 These results indicate that carbazole-functionalized cellulose has the potential to serve as the hole-transporting materials in organic light-emitting diodes. This study, which highlighted the utility of modifying the functional groups in cellulose with electroactive moieties, pioneered the early stages for developing renewable materials for electronic device applications.…”

“…Usually, the substrates, electrodes, electron-transporting layers, hole-transporting layers and light-emitting layers in common organic light emitting diodes configurations are made of petroleum-based products rather than materials derived from renewable sources. However, Karakawa et al 66 reported the first synthesis of fluorescent polymers based on cellulose modified with alkyl carbazole derivatives ( Figure 9). The ionization potentials of the cellulose derivatives are~5.8 eV.…”