Method for rapidly evaluating reliability of LED (light-emitting diode) product under multi-stress condition
An evaluation method and reliability technology, applied in the field of rapid evaluation of multi-stress LED reliability, can solve the problems of impossibility to be accurate, the model cannot be applied with multiple stresses, and there is no satisfactory prediction method for the service life of LED, and achieves the key to improvement. technology, the effect of improving product quality
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[0015] In the most widely used Arrhenius model, where τ is the service time, τ r Is the lifetime at the reference temperature, Ea is the activation energy (eV), k is the Boltzmann constant (8.617×10 -5 eV / K), T is the absolute temperature (K), the temperature acceleration coefficient A T ,for:
[0016] A T = τ 2 τ 1 = e Ea k ( 1 T 2 - 1 T 1 )
[0017] The Arrhenius model assumes that only the accelerating stress of temperature has an effect. The Eyring model further considers multiple stresses such as current and humidity:
[0018] Assuming that only current acceleration is considered using the inverse power law, assuming only current acceleration stress:
[0019] τ﹦τ r I -N, I is the current, n is the current acceleration parameter,
[0020] Then the current acceleration coefficient A I for:
[0021] Also consider only humidity acceleration stress:
[0022] τ﹦τ r H -M
[0023] Humidity acceleration A H for: A ...
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