Electrically　pumped　organic　lasers　have　been　a　challenge　for　years.　The　most　crucial　problem　is　that　the　density　of　charge　carriers　is　much　lower　than　the　threshold　required　for　lasing　as　compared　with　optical　pumping.　Apparently,　increasing　the　density　of　charge　carriers　and　reducing　the　threshold　are　two　practical　routes　for　solving　the　problem.　Reducing　the　pump　threshold　depends　strongly　on　the　structural　design　and　the　operation-mode　control　in　the　device.　Here,　a　large-area　array　of　microcavities　is　employed　to　construct　the　light-emitting　diodes　(LEDs)　using　distributed　Bragg　gratings　(DBGs)　as　high-efficiency　reflectors　and　the　homogeneous　poly[(9,9-dioctylfluorenyl-2,7-diyl)-alt-co-(1,4-benzo-(2,1,3)-thiadiazole)]　films　in-between　as　the　active　cavity　body.　Simultaneous　lasing　of　multiple　longitudinal　modes　at　optical　pumping　verifies　the　optical　feedback　and　oscillation　mechanisms　in　such　DBG-based　microcavities.　Further　successful　construction　of　light-emitting　diodes　using　these　microcavity　arrays　and　the　observation　of　narrowing　of　the　electroluminescence　spectrum　due　to　the　selectivity　by　the　microcavities　and　the　increase　of　the　excitation　electrical　field　suggest　that　the　LED　design　here　defines　a　promising　step　toward　electrically　pumped　polymer　lasers.