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  • 1
    Electronic Resource
    Electronic Resource
    Highly efficient and bright doped organic electroluminescent diodes using an aluminum electrode (1999)
    Springer
    Optical and quantum electronics 31 (1999), S. 1227-1233 
    Details
    ISSN: 1572-817X
    Keywords: brightness ; efficiency ; electroluminescence ; organic diode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Remarkable improvement in efficiency and electroluminescence (EL) has been observed in an organic EL device, which consists of a hole-transport layer and a luminescent layer. The hole-transport layer is an N,N′-bis(3-methyphenyl)-N,N′-diphenylbenzidine film. The doped emitting layer consists of 8-(quinolinolate)-aluminum as the host and rubrene as the emission dopant. The doped cell with aluminum cathode demonstrated a luminance in excess of 20,000 cd/m2 and an external quantum efficiency of 2.7%, which is about four times and three times, respectively, greater than those of the undoped cell. The EL emission from the device shows spectral narrowing and a shift to higher energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006936914557
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A note on optimal multiway split trees (1991)
    Springer
    BIT 31 (1991), S. 220-229 
    Details
    ISSN: 1572-9125
    Keywords: E.1 ; I.1.2 ; Split tree ; dynamic programming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract Split trees are suitable data structures for storing records with different access frequencies. Under assumption that the access frequencies are all distinct, Huang has proposed anO(n 4 logm) time algorithm to construct an (m+1)-way split tree for a set ofn keys. In this paper, we generalize Huang's algorithm to deal with the case of non-distinct access frequencies. The technique used in the generalized algorithm is a generalization of Hesteret al.'s, where the binary case was considered. The generalized algorithm runs inO(n 5 logm) time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01931282
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    Paper (German National Licenses)
    Fulltext
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