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Novel cladding structure for ZnSe‐based white LEDs with longer lifetime over 10,000 hours
Author(s) -
Nakamura T.,
Katayama K.,
Mori H.,
Fujiwara S.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200404973
Subject(s) - cladding (metalworking) , light emitting diode , optoelectronics , materials science , optical power , layer (electronics) , optics , nanotechnology , composite material , physics , laser
We have demonstrated ZnSe‐based white LEDs with longer lifetime over 10,000 h at 14.5 A/cm 2 by introducing an i‐ZnMgBeSe/p‐ZnMgSe double cladding structure, which combined a very thin i‐ZnMgBeSe layer for suppressing electron overflow and p‐ZnMgSSe for efficient p‐type carrier concentration. By adopting the double cladding layer instead of the conventional p‐ZnMgSSe cladding layer, rapid degradation is suppressed. The device simulation and the temperature dependence of optical power showed that the i‐ZnMgBeSe layer played the main role in increasing electron confinement. Our reliability test results indicate that the suppression of the electron overflow is essential to obtain long lifetime acceptable for truly practical use. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)