A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs
The effect of relative humidity on LEDs and how the moisture incursion is associated to the color shift is studied. This paper proposes a different approach to describe the lumen degradation of LEDs due to the long-term effects of humidity. Using the lumen degradation data of different types of LEDs...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IEEE
2018-01-01
|
| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/8472891/ |
| _version_ | 1818616784199090176 |
|---|---|
| author | Thong Kok Law Fannon Lim |
| author_facet | Thong Kok Law Fannon Lim |
| author_sort | Thong Kok Law |
| collection | DOAJ |
| description | The effect of relative humidity on LEDs and how the moisture incursion is associated to the color shift is studied. This paper proposes a different approach to describe the lumen degradation of LEDs due to the long-term effects of humidity. Using the lumen degradation data of different types of LEDs under varying conditions of relative humidity, a humidity based degradation model (HBDM) is developed. A practical estimation method from the degradation behaviour is proposed to quantitatively gauge the effect of moisture incursion by means of a humidity index. This index demonstrates a high correlation with the color shift indicated by the LED's yellow to blue output intensity ratio. Physical analyses of the LEDs provide a qualitative validation of the model, which provides good accuracy with longer periods of moisture exposure. The results demonstrate that the HBDM is an effective indicator to predict the extent of the long-term impact of humidity and associated relative color shift. |
| first_indexed | 2024-12-16T16:55:18Z |
| format | Article |
| id | doaj.art-744aa16f4e844e17b43f48ce3a388668 |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-12-16T16:55:18Z |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-744aa16f4e844e17b43f48ce3a3886682022-12-21T22:23:54ZengIEEEIEEE Photonics Journal1943-06552018-01-0110511410.1109/JPHOT.2018.28697268472891A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDsThong Kok Law0https://orcid.org/0000-0003-4296-170XFannon Lim1School of Engineering, University of Glasgow, Glasgow, U.K.School of Engineering, University of Glasgow, Glasgow, U.K.The effect of relative humidity on LEDs and how the moisture incursion is associated to the color shift is studied. This paper proposes a different approach to describe the lumen degradation of LEDs due to the long-term effects of humidity. Using the lumen degradation data of different types of LEDs under varying conditions of relative humidity, a humidity based degradation model (HBDM) is developed. A practical estimation method from the degradation behaviour is proposed to quantitatively gauge the effect of moisture incursion by means of a humidity index. This index demonstrates a high correlation with the color shift indicated by the LED's yellow to blue output intensity ratio. Physical analyses of the LEDs provide a qualitative validation of the model, which provides good accuracy with longer periods of moisture exposure. The results demonstrate that the HBDM is an effective indicator to predict the extent of the long-term impact of humidity and associated relative color shift.https://ieeexplore.ieee.org/document/8472891/High power light emitting diodesrelative humiditylumen degradationcolor shiftmoisture incursionyellow-blue ratio |
| spellingShingle | Thong Kok Law Fannon Lim A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs IEEE Photonics Journal High power light emitting diodes relative humidity lumen degradation color shift moisture incursion yellow-blue ratio |
| title | A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs |
| title_full | A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs |
| title_fullStr | A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs |
| title_full_unstemmed | A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs |
| title_short | A Practical Degradation Based Method to Predict Long-Term Moisture Incursion and Color Change in High Power LEDs |
| title_sort | practical degradation based method to predict long term moisture incursion and color change in high power leds |
| topic | High power light emitting diodes relative humidity lumen degradation color shift moisture incursion yellow-blue ratio |
| url | https://ieeexplore.ieee.org/document/8472891/ |
| work_keys_str_mv | AT thongkoklaw apracticaldegradationbasedmethodtopredictlongtermmoistureincursionandcolorchangeinhighpowerleds AT fannonlim apracticaldegradationbasedmethodtopredictlongtermmoistureincursionandcolorchangeinhighpowerleds AT thongkoklaw practicaldegradationbasedmethodtopredictlongtermmoistureincursionandcolorchangeinhighpowerleds AT fannonlim practicaldegradationbasedmethodtopredictlongtermmoistureincursionandcolorchangeinhighpowerleds |