Figure 4

Schematic of nonlinear thermal-anchoring (NTA) and results.

(a) In thermal anchoring, behaves as the anchor, which is maintained constant by the temperature controller and can also transport the thermal energy away to outside the sample. The experimental procedure includes: (1) set  °C and obtain I-V characteristic curves of nine LED samples for various currents ranging from to . Measurements are taken after the current is switched on, assuring that the steady state was reached. (2) set  °C and measure I-V characteristic curves as step (1). (b) IV characteristic curves measured according to the experimental procedure in a for nine samples at  °C. These curves for same-colored samples appear almost indistinguishable. (c) measured using NTA for B1# sample. (d) measured using NTA for G1# sample. (e) T j measured using NTA for R1# sample. NTA for G1# sample. (e) measured using NTA for R1# sample.