Jpn. J. Appl. Phys. 15 (1976) pp. 1287-1296  |Next Article|  |Table of Contents|
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Degradation of GaP Green LEDs

Kunio Kaneko

(Received December 25, 1975)

The change of the emission intensities of the green and the red components of GaP green LEDs with a weak red emission band was investigated during aging under forward bias operation. The green emission intensity measured at a given current decreased with time as L=L₀exp (-√t/τ) but remained constant when measured at a given voltage. The increase of the red emission intensity evaluated at a given current or voltage indicated the increase of Zn–O recombination centers. The increase of the forward nonradiative excess current is responsible for the degradation of the green emission. The temperature and current dependences of the degradation rate of green (1/τ) and the enhancement of red (k_D) were expressed by similar formulas 1/τ=A^-1I^1.29exp (-0.33 eV/kT) and k_D=BI^1.21exp (-0.32 eV/kT). This fact suggests that the interstitial zinc plays a dual role of the degradation of the green band and the enhancement of the red one.

URL: http://jjap.jsap.jp/link?JJAP/15/1287/
DOI: 10.1143/JJAP.15.1287

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