摘要:
本文用4×10~4Ci(1 Ci=3.7×10~(10)Bq)的~(60)Co源(剂量率2×10~5rad(Si)/h)对GaN基InGaN/GaN多量子阱蓝光LED进行5种剂量的γ射线的辐照实验.通过辐照前后蓝光LED的波长、色纯度、最大半峰宽(FWHM)和电流-电压(I-V)、电流-光通量(I-F)等电光学特性分析,得到γ射线对GaN基LED器件的辐照效应.结果发现,辐照后LED器件的发光一致性和均匀性变差,在20 mA工作电流下,最大剂量下器件发光强度衰减近90%,光通量衰减约40%,并得到器件的抗辐照能力的参数τ_0K_γ为4.039×10~(-7)rad·s~(-1),发现较低的正向偏压下(小于2.6 V)器件的饱和电流随辐照总剂量增大而增大.
Abstract:
We study the irradiation effects of the GaN-based blue light-emitting diodes(LEDs) with InGaN/GaN multi-quantum well irradiated by five doses of ~(60)Co (4×10~4Ci) at room temperature. From the analyses of the characteristics of the current-voltage (Ⅰ-Ⅴ) relation, current-luminous flux (F-L) relation, chromatic purity, luminous intensity, luminous flux, the full width at half maximum, and the wavelength of LEDs samples before and after irradiation, we obtain the effects of γ irradiation on the devices. It shows that the consistency and uniformity of the samples become worse after irradiation, At the 20 mA working current, the luminous intensity reduces by 90% and the luminous flux falls by 40% at the maximum total dose. The quantity τ_οK_γ describing the radiation hardness of the LEDs is equal to 4. 039 ×10~(-7)rad · s~(-1), and the saturation current increases at lower positive bias (< 2.6V) with the increasing total dose.
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