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Enhanced performance of photonic crystal GaN light-emitting diodes with graphene transparent electrodes.

Ge HL, Xu C, Xu K, Xun M, Wang J, Liu J - Nanoscale Res Lett (2015)

Bottom Line: Specially, we found that the part of the graphene suspending over the air hole of the PC structure was of much higher conductivity, which reduced the average sheet resistance of the graphene transparent conducting electrode and improved the current spreading of the PC LED.Therefore, the work voltage of the DGTE-PC LED was obviously decreased, and the output power was greatly enhanced.The results show that the etching of PC structure results in the degradation of the current spreading and that the graphene transparent conducting electrode can offer an uniform current spreading in the DGTE-PC LED. 85.60.Jb; 68.65.Pq; 42.70.Qs.

View Article: PubMed Central - PubMed

Affiliation: The Key Laboratory of Optoelectronics Technology, Ministry of Education, Beijing University of Technology, Beijing, 100124 People's Republic of China.

ABSTRACT

Unlabelled: The two-dimensional (2D) triangle lattice air hole photonic crystal (PC) GaN-based light-emitting diodes (LED) with double-layer graphene transparent electrodes (DGTE) have been produced. The current spreading effect of the double-layer graphene (GR) on the surface of the PC structure of the LED has been researched. Specially, we found that the part of the graphene suspending over the air hole of the PC structure was of much higher conductivity, which reduced the average sheet resistance of the graphene transparent conducting electrode and improved the current spreading of the PC LED. Therefore, the work voltage of the DGTE-PC LED was obviously decreased, and the output power was greatly enhanced. The COMSOL software was used to simulate the current density distribution of the samples. The results show that the etching of PC structure results in the degradation of the current spreading and that the graphene transparent conducting electrode can offer an uniform current spreading in the DGTE-PC LED.

Pacs: 85.60.Jb; 68.65.Pq; 42.70.Qs.

No MeSH data available.


The light emission patterns of B2# and B0#. (a) Photographic images of the B2# sample; (b) photographic images of the B0# sample.
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Fig4: The light emission patterns of B2# and B0#. (a) Photographic images of the B2# sample; (b) photographic images of the B0# sample.

Mentions: Figure 4 shows the light emission patterns of B2# and B0#, under injection current of I = 20 mA. The light emission of the B0# sample is rather uneven, resulting from the lack of the graphene transparent conducting electrode. In contrast, the B2# sample shows uniform light emitting over the entire LED surface, indicating that the double-layer graphene film offers a sufficient current spreading.Figure 4


Enhanced performance of photonic crystal GaN light-emitting diodes with graphene transparent electrodes.

Ge HL, Xu C, Xu K, Xun M, Wang J, Liu J - Nanoscale Res Lett (2015)

The light emission patterns of B2# and B0#. (a) Photographic images of the B2# sample; (b) photographic images of the B0# sample.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385276&req=5

Fig4: The light emission patterns of B2# and B0#. (a) Photographic images of the B2# sample; (b) photographic images of the B0# sample.
Mentions: Figure 4 shows the light emission patterns of B2# and B0#, under injection current of I = 20 mA. The light emission of the B0# sample is rather uneven, resulting from the lack of the graphene transparent conducting electrode. In contrast, the B2# sample shows uniform light emitting over the entire LED surface, indicating that the double-layer graphene film offers a sufficient current spreading.Figure 4

Bottom Line: Specially, we found that the part of the graphene suspending over the air hole of the PC structure was of much higher conductivity, which reduced the average sheet resistance of the graphene transparent conducting electrode and improved the current spreading of the PC LED.Therefore, the work voltage of the DGTE-PC LED was obviously decreased, and the output power was greatly enhanced.The results show that the etching of PC structure results in the degradation of the current spreading and that the graphene transparent conducting electrode can offer an uniform current spreading in the DGTE-PC LED. 85.60.Jb; 68.65.Pq; 42.70.Qs.

View Article: PubMed Central - PubMed

Affiliation: The Key Laboratory of Optoelectronics Technology, Ministry of Education, Beijing University of Technology, Beijing, 100124 People's Republic of China.

ABSTRACT

Unlabelled: The two-dimensional (2D) triangle lattice air hole photonic crystal (PC) GaN-based light-emitting diodes (LED) with double-layer graphene transparent electrodes (DGTE) have been produced. The current spreading effect of the double-layer graphene (GR) on the surface of the PC structure of the LED has been researched. Specially, we found that the part of the graphene suspending over the air hole of the PC structure was of much higher conductivity, which reduced the average sheet resistance of the graphene transparent conducting electrode and improved the current spreading of the PC LED. Therefore, the work voltage of the DGTE-PC LED was obviously decreased, and the output power was greatly enhanced. The COMSOL software was used to simulate the current density distribution of the samples. The results show that the etching of PC structure results in the degradation of the current spreading and that the graphene transparent conducting electrode can offer an uniform current spreading in the DGTE-PC LED.

Pacs: 85.60.Jb; 68.65.Pq; 42.70.Qs.

No MeSH data available.