The authors present a method for fabricating stable white-light-emitting electrochemical cells utilizing emission from exciplexes formed between a blue-emitting fluorene polymer and aromatic amines.
लेखकों बहुलक प्रकाश उत्सर्जक विद्युत कोशिकाओं से स्थिर सफेद प्रकाश उत्सर्जन (PLECs) एक सक्रिय परत ब्लू-फ्लोरोसेंट पाली (9,9-di-n-dodecylfluorenyl-2,7-diyl) के होते हैं जो होने fabricating के लिए एक दृष्टिकोण प्रस्तुत ( PFD) और π संयुग्मित triphenylamine अणुओं। यह सफेद प्रकाश उत्सर्जन इलेक्ट्रॉनिक रूप से उत्साहित राज्यों में PFD और amines के बीच का गठन exciplexes से निकलती है। PFD, 4,4 युक्त ',' 4 'ए डिवाइस – Tris [2-naphthyl (फिनाइल) अमीनो] triphenylamine (2-TNATA), पाली (एथिलीन ऑक्साइड) और कश्मीर 2 सीएफ 3 तो 3 आयोग के साथ सफेद प्रकाश उत्सर्जन से पता चला है इंटरनेशनेल डे ल ECLAIRAGE (सीआईई) (0.33, 0.43) का समन्वय करता है और एक रंग प्रतिपादन सूचकांक (CRI) 3.5 वी लगातार वोल्टेज माप का एक आवेदन वोल्टेज पर रा = 73 के पता चला कि सीआईई (0.27, 0.37), रा के निर्देशांक 67, और उत्सर्जन में 5 वी के एक वोल्टेज के आवेदन के बाद तुरंत मनाया रंग लगभग अपरिवर्तित और बाद में स्थिर थे300 सेकंड।
Research and development of polymer light-emitting electrochemical cells (PLECs) have expanded in recent years.1-15 PLECs are similar to organic light-emitting diodes (OLEDs) in that both are surface emitting organic devices and are expected to find their way into future lighting applications. OLEDs are already on the market, but the cost is still high, one reason being that OLEDs need a complicated device structure with multiple layers. In contrast, PLECs have a very simple device structure which consists of a single active layer (emitting layer) between a pair of electrodes. This means that PLECs are suited to mass production processes such as roll-to-roll printing and coating.
A PLEC has an active layer consisting of a fluorescent π-conjugated polymer (FCP). The FCP can be electrochemically doped with a polymer electrolyte (a mixture of an ion conducting polymer and a salt). The FCP is p-doped on the anode side and n-doped on the cathode side during operation, and generates excitons which emit light between the p- and n-doped regions. Therefore, the emission color reflects the exciton emission (=fluorescence) wavelength of the FCP.
Stable white light emission is important for lighting applications, and color mixing techniques which employ two or more emitters have been widely used to achieve this.10-14 Recently, we presented a different approach for obtaining stable white light emission, using an active layer which contains blue-fluorescent poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD) and π-conjugated aromatic amines15. This white light emission comes from exciplexes formed between PFD and amine molecules in excited states. Exciplex emission has a broader spectrum compared to the exciton emission from the PDF and/or amines, which gives it a color close to that of natural light. This translates to a higher color rendering index (CRI), which is preferable for lighting applications.
In this article, the authors describe the procedure used to fabricate the exciplex based LECs and show the stability of their white light emission.
LEC एक सक्रिय परत हाइड्रोफोबिक PFD और खुशबूदार amines, और हाइड्रोफिलिक पॉलीथीन ऑक्साइड और KCF 3 तो 3 से युक्त है। क्योंकि इन सामग्रियों को बहुत अलग solubilities है, स्पिन कोटिंग समाधान की सावधान तैयारी अधूरी solvation स…
The authors have nothing to disclose.
इस काम आंशिक वैज्ञानिक अनुसंधान के लिए एक ग्रांट-इन-एड (नं 24225003) द्वारा समर्थित किया गया। इस काम JX निप्पॉन ऑयल एंड एनर्जी कारपोरेशन द्वारा आर्थिक रूप से समर्थन किया था।
Poly(9,9-di-n-dodecylfluorenyl-2,7-diyl) (PFD) | Aldrich | 571660 | |
4,4’,4’’-Tris[2-naphthyl(phenyl)amino]triphenylamine (2-TNATA) | Aldrich | 768669 | |
9,9-Dimethyl-N,N’-di(1-naphthyl)-N,N’-diphenyl-9H-fluorene-2,7-diamine (DMFL-NPB) | Aldrich | ||
Poly(ethylene oxide) (PEO) | Aldrich | 182028 | |
Potassium tirifluoromethansulfonate (KCF3SO3) | Aldrich | 422843 | dried under vacuum at 200 °C for 2 hr prior to use |
Chloroform | Kanto Chemical Co. | 08097-25 | dehydrated |
Cyclohexanone | Kanto Chemical Co. | 07555-00 | |
SCAT 20-X (detergent) | Daiichi Kogyo Seiyaku | diluted with water | |
Acetone | Kanto Chemical Co. | 01866-25 | Electronic grage |
2-propanol | Kanto Chemical Co. | 32439-75 | Electronic grage |
13mm GD/X Disposable Filter Device PVDF Filter Media, Polypropylene Housing | Whatman | 6872-1304 | |
UV/O3 Treating Unit | SEN Lights Co. | SSP16-110 | |
Spectral Photo Detector | Otsuka Electronics | MCPD 9800 | |
Voltage Current Source Monitor | ADCMT | 6241A | |
Evaporation Mask | Tokyo Process Service Co., Ltd. | NA | The evaporation mask was wet-etched to create openings for patterned deposition of aluminum. The size of the mask is 100 mm x 100 mm x 0.2 mm-thick. |