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violet light emitting
Shuji Nakamura, Masayuki Senoh, and Takashi Mukai
Departm.ent of Research and Development, Nichia Chemical Industries, Ltd., 491 Oka, Kaminaka, Anan, Tokushima 774, Japan
(Received 2 November 1992; acceptedfor publication 15 February 1993) InGaN/GaN double-heterostructurelight-emitting diodes were fabricated. The output power was 90 PW and the external quantum elhciency was as high as 0.15% at a forward current of 20 mA at room temperature. The peak wavelengths of the electroluminescence(EL) varied between 411 and 420 nm with changesin the growth temperatures of an InGaN active layer between 820 and 800 "C. The full widths at half maximum of EL were between 22 and 25 nm. Recently, there has been much progressin wide-bandgap II-VI compound semiconductor research,in which the first blue-green' and blue injection laser diodes (LDs)~ as well as high-efficiency blue-light emitting diodes (LEDs) 3 have been demonstrated. On the other ...
COMPLEMENTARY ELECTROCHROMIC DISPLAY SYSTEM BASED ON PRUSSIAN BLUE THIN FILM
*M.S. Roy, A.K. Gautam, Yojana Janu, N. Prasad & Manish Kumar
Defence Laboratory, Jodhpur-342011 Rajasthan, India *email@example.com Abstract: An approach based on thin film/solution type Electrochromic System is described here wherein coloration from blue to colorless is realized under applied DC voltage pulse. Iron (III) hexacyanoferrate (II) is more commonly known as Prussian blue and shows intense blue color due to inter valence electron transports. Thin film of PB is developed on ITO by the electrochemical reduction of solution containing iron (III) and hexacyanoferrate (III) ions. Further, the two step reduction process in PB/Organic ionic system shows reversible electrochromism. The first step involves one electron reduction of Prussian blue at -1 volt. In the second stage further one electron reduction of thin film of PB is realized at -1.5 volt. In this system, blue(PB) to colorless (PW) state is realized while ...